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X-12=0
X=12
12+7X-1+X=71
11+8X=71
8X=71-11
8X=60
X=60/8
X=7.5
X+2X=60
3X=60
X=60/3
X=20
7+2X=31
2X=31-7
X=24/2
X=12
5X-3X=102
2X=102
X=102/2
X=51