25b-(b-5)=29.7x+2(3x-3)=

问题描述:

25b-(b-5)=29.7x+2(3x-3)=
25b-(b-5)=29.7x+2(3x-3)=20.8y-3(3y+2)=6

1)5a+(2-4a)=0
5a-4a=-2
a=-2
(2)25b-(b-5)=29
25b-b=29-5
24b=24
b=1
(3)7x+2(3x-3)=20
7x+6x=20+6
13x=26
x=2
(4)8y-3(3y+2)=6
8y-9y=6+6
-y=12
y=-12