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3x+12=-5x-36
3x+5x=-36-12
8x=-48
x=-48/8
x=-6
5(r+6)=-5(r-4)
5r+30=-5r+20
5r+5r=20-30
10r=-10
r=-10/10
r=-1
9(z-6)=4(z+4)
9z-54=4z+16
9z-4z=16+54
5z=70
z=70/5
z=14