1)
a)7x+8=2(x+9)
7x+8=2x+18
7x-2x=18-8
5x=10
x=10:5
x=2
b)2(x+3)=5x+12
2x+6=5x+12
2x-5x=12-6
-3x=2 / x(-1)
3x=-2
x=-2 / 3
c)4(x+5)=7x+32
4x+20=7x+32
4x-7x=32-20
-3x=12 / x(-1)
3x=-12
x=-12:3
x=-4
d)5(x+3)=4+3(x+7)
5x+15=4+3x+21
5x+15=25+3x
5x-3x=25-15
2x=10
x=10:2
x=5
e)14x+23=5(x-6)-1
14x+23=5x-30-1
14x+23=5x-31
14x-5x=-31-23
9x=-54
x=-54:9
x=-6
f)11x+31=6(x-6)+2
11x+31=6x-36+2
11x+31=6x-34
11x-6x=-34-31
5x=-65
x=-65:5
x=-13
g) 4x+13=3(x+5)
4x+13=3x+15
4x-3x=15-13
x=2
h)8x+19=5(x+7)+2
8x+19=5x+35+2
8x+19=5x+37
8x-5x=37-19
3x=18
x=18:3
x=6
2 ) a) 3(5x-7)=11x-17
15x-21=11x-17
15x-11x=-17+21
4x=4
x=4:4
x=1
b)17(2-3x)=3(13-19x)
34-51x=39-57x
34-39=-57x+51x
-5=-6x / x(-1)
5=6x
6x=5
x= 5/6
