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12-12+3a=5-12+2a
3a =-7+2a
3a-2a =-7+2a-2a
a =-7
b.2(x+1)=2(x+4)
2x+2 =2x+8
2x+2-2=2x+8-2
2x =2x+6
2x-2x =2x-2x+6
0=6