7x-(3+2x)=x+9 13-(2x-5)=x-3 3x-(10-9x)=22x 26-(17-2x)=5x 5(3-2y)-4(9-y)=3(y+5)...

1)7х-(3+2х)=х+9
7х-3-2х=х+9
5х-х=9+3
4х=12
х= $\frac{12}{4}$ =3
2)13-(2х-5)=х-3
13-2х+5=х-3
-2х-х=-18-3
-3х=-21
х= $\frac{-21}{-3}$ =7
3)3х-(10-9х)=22х
3х-10+9х=22х
12х-22х=10
-10х=10
х= $\frac{10}{-10}$ =-1
4)26-17+2х=5х
2х-5х=-9
-3х=-9
х= $\frac{-9}{-3}$ =3
5)5(3-2у)-4(9-у)=3(у+5)
15-10у-36+4у=3у+15
-21-6у=3у+15
-6у-3у=21+15
-9у=36
у= $\frac{36}{-9}$ =-4
6)28х-42-5х-20=6х+10+5х
23х-6х-5х=42+20+10
12х=72
х= $\frac{72}{12}$ =6
8)42х-66-13х-78=28х+14
29х-28х=66+14
Х=80