Решите уравнения и сделайте проверку.

Задание 6: 6.а) 2y + 3y = 150 -> 5y = 150 -> y = 30. Проверка: 2*30+3*30 = 60+90 = 150. 6.б) 48 + 7x = 118 -> 7x = 70 -> x = 10. Проверка: 48+7*10 = 48+70 = 118. 6.в) 129 - 3x = 93 -> 3x = 36 -> x = 12. Проверка: 129-3*12 = 129-36 = 93. 6.г) 3x + 45 = 60 -> 3x = 15 -> x = 5. Проверка: 3*5+45 = 15+45 = 60. 6.д) 72 - 5x = 32 -> 5x = 40 -> x = 8. Проверка: 72-5*8 = 72-40 = 32. 6.е) 128 - 4z + 16 = 100 -> 144 - 4z = 100 -> 4z = 44 -> z = 11. Проверка: 128-4*11+16 = 128-44+16 = 100. Задание 7: 7.а) 9x - 4x = 85 -> 5x = 85 -> x = 17. Проверка: 9*17-4*17 = 5*17 = 85. 7.б) 120 : 3x = 8 -> 3x = 120 : 8 -> 3x = 15 -> x = 5. Проверка: 120 : (3*5) = 120 : 15 = 8. 7.в) 52 + 7y = 108 -> 7y = 56 -> y = 8. Проверка: 52+7*8 = 52+56 = 108. 7.г) 106 - 5z = 31 -> 5z = 75 -> z = 15. Проверка: 106-5*15 = 106-75 = 31. 7.д) 134 - 9z + 28 = 63 -> 162 - 9z = 63 -> 9z = 99 -> z = 11. Проверка: 134-9*11+28 = 134-99+28 = 63. 7.е) 83 + 21x - 17x = 131 -> 83 + 4x = 131 -> 4x = 48 -> x = 12. Проверка: 83+21*12-17*12 = 83+4*12 = 83+48 = 131. Задание 8: 8.а) 3a + 19a - 17a = 65 -> 5a = 65 -> a = 13. Проверка: 3*13+19*13-17*13 = (3+19-17)*13 = 5*13 = 65. 8.б) 60 - 12y + 8y = 24 -> 60 - 4y = 24 -> 4y = 36 -> y = 9. Проверка: 60-12*9+8*9 = 60-4*9 = 60-36 = 24. 8.в) 12a + 17a + a = 789 + 111 -> 30a = 900 -> a = 30. Проверка: 12*30+17*30+30 = (12+17+1)*30 = 30*30 = 900. 8.г) 3 * (19 + 2y) = 99 -> 19 + 2y = 33 -> 2y = 14 -> y = 7. Проверка: 3*(19+2*7) = 3*(19+14) = 3*33 = 99. 8.д) 7 * (15 - 2y) = 97 - 76 -> 7 * (15 - 2y) = 21 -> 15 - 2y = 3 -> 2y = 12 -> y = 6. Проверка: 7*(15-2*6) = 7*(15-12) = 7*3 = 21. 8.е) 2 * (67 - 3y - y) = 30 -> 67 - 4y = 15 -> 4y = 52 -> y = 13. Проверка: 2*(67-3*13-13) = 2*(67-52) = 2*15 = 30.