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5a-12-(3(a+2))=0
3(a+2)
3a+6
-(3a+6)
5a-3a-6-12=0
2a-18=0
2a=18
a=18/2
a=9
5a-12=3a+6
5a-3a=6+12
2a=18
a=18/2
a=9