Ответ:

1) 4x-10x+16x = 10x

2) -8y-12y+6y = -14y

3) 2(3x+4)-6x = 6x+8-6x = 8

4) -3(6-5x)+20 = -18+15x+20 = 2+15x

5) 9x-4y+8x+18y = 17x+14y

Ответ:

1)10x

2)-14y

3)18x

4)2+15x

5)17x+14y