c) 15x-15+8-12x=9-2x-8
3x-7=1-2x
5x=8
x=8/5
d) 2x+5+9x-3=8-56x+2-3x
11x+2=-59x+10
70x=8
x=8/70
=4/35
e) 30-10x+6x+12=13+14x-7
-4x+42=14x+6
18x=36
x=36/18
=2
