39x-(6x-5-12+7x)=42
39x-6x+5+12-7x=42
26x+17=42
26x=42-17
26x=25
x=25/26
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39x-(6x-5-12+7x)=42
39x-6x+5+12-7x=42
26x+17=42
26x=42-17
26x=25
x=25/26