Respuesta :

1)  -16a+3+7a-6 = -9a - 3

2)  
14x+8y+12y-20x = 20y - 6x

3)  
-3(8p-6)+4p = 18-20p

4)   
(9x+2y-8) - (12x+11 = -3x + 2y - 19