Упростите выражения

1. $4(3a-c) - (5a-2c) = 12a - 4c - 5a + 2c = (12-5)a + (-4+2)c = 7a - 2c$ 2. $-(3y-5c) + 2(y+c) = -3y + 5c + 2y + 2c = (-3+2)y + (5+2)c = -y + 7c$ 3. $-(3a-c) + 3(3c-a) = -3a + c + 9c - 3a = (-3-3)a + (1+9)c = -6a + 10c$ 4. $-2(k-a) - 3(a+2k) = -2k + 2a - 3a - 6k = (-2-6)k + (2-3)a = -8k - a$ 5. $-(-3y-a) + (-a+2y) = 3y + a - a + 2y = (3+2)y + (1-1)a = 5y$ 6. $4(3a-p) - (-2a+3p) = 12a - 4p + 2a - 3p = (12+2)a + (-4-3)p = 14a - 7p$ 7. $-(-23a+g) + 12(2a+y) = 23a - g + 24a + 12y = (23+24)a - g + 12y = 47a - g + 12y$ 8. $-2(3a-4y) + 3(2y-4a) = -6a + 8y + 6y - 12a = (-6-12)a + (8+6)y = -18a + 14y$ 9. $-2(k-2y) + 3(3y-4k) = -2k + 4y + 9y - 12k = (-2-12)k + (4+9)y = -14k + 13y$ 10. $21(-k-4x) - 4(-3k+10x) = -21k - 84x + 12k - 40x = (-21+12)k + (-84-40)x = -9k - 124x$ 11. $12(-2x+4c) - 2(-10y-12c) = -24x + 48c + 20y + 24c = -24x + 20y + (48+24)c = -24x + 20y + 72c$ 12. $-2(3y+2b) + 3(-4b+2y) = -6y - 4b - 12b + 6y = (-6+6)y + (-4-12)b = -16b$ 13. $2(2y-3b+1) - (2-4y+5b) = 4y - 6b + 2 - 2 + 4y - 5b = (4+4)y + (-6-5)b + (2-2) = 8y - 11b$ 14. $-5(c-2y) + 2(5c-2y) = -5c + 10y + 10c - 4y = (-5+10)c + (10-4)y = 5c + 6y$