ivawka2006 1)9b+6b-15=615
15b-15=615
15b=615+15
15b=630
b=630/15
b=42

2)2a+123a+97=472
125a+97=472
125a=472-97
125a=375
a=375/125
a=3

3)17x-x+5x-19=170
21x-19=170
21x=170+19
21x=189
x=189/21
x=9

4)73y-y-22y+40=190
50y+40=190
50y=190-40
50y=150
y=150/50
y=3