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2((12+2x)+(15+2-))=74
We move all terms to the left:
2((12+2x)+(15+2-))-(74)=0
We add all the numbers together, and all the variables
2((2x+12)+0)-74=0
We move all terms containing x to the left, all other terms to the right
2((2x+12)+0)=74
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