9X=6X+12=0 - x=4
5X-1=3X+11=0 - x=6
5X-12=0 - 3
3(2X+1)=0 - -9
8X-21=0 - 3
6X=2X+16=0 - x=4
2X-5=X=1 - x=6
2X+2=0 - x=4
X+75=0 - x=25