4) 5x-3=17
5x=17+3
5x=20
x=20/5
x=4
5) 2x+7=13
2x=13-7
2x=6
x=6/2
x=3
7) 15(-5y+4)=-3(13y+4)
-75y+60=-39y-12
60+12=75y-39y
72=36y
y=72/36
y=2
8) 2x-18=3x+2x-6
6-18=3x+2x-2x
-12=3x
x=-12/3
x=-4
10) 5x+7x=36
12x=36
x=36/12
x=3
11) 7y+5,5=2y
7y-2y=-5,5
5y=-5,5
y=-5,5/5
y=-1,1
12) 10x+36-20x=16
36-16=20x-10x
20=10x
x=20/10
x=2
13) 3(16-3x)-10(1+x)=0
48-9x-10-10x=0
48-10=9x+10x
38=19x
x=38/19
x=2
14) 2z+12=z+18
2z-z=18-12
z=6
15) 19,1-2,4x-10,4=2,4x+3,9
19,1-10,4-3,9=2,4x+2,4x
4,8=4,8x
x=4,8/4,8
x=1