Question

-200y-y-y+200y=

-56d+76d+3d+20d=

1001x-2x+75x+23x-1001x+2x-75x

28b-56b 2b-28b+56b

Answer 1

-202y+200y= -2y

-56d+76d +3d+20d=43d

1001x-2x+75x+23x-1001x+2x-75x= 23x

28b-56b+2b-28b+56b=2x

ou com o nemos no 2b

Answer 2

(-200-1-1+200)y= -2y
(-56+76+3+20)d= 43d
(1001-2+75+23-1001+2-75)x= +23x
(28-56+2-28+56)b= +2b