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3((2x+5)-10)+2x+5+x=42
We move all terms to the left:
3((2x+5)-10)+2x+5+x-(42)=0
We add all the numbers together, and all the variables
3x+3((2x+5)-10)-37=0
We move all terms containing x to the left, all other terms to the right
3x+3((2x+5)-10)=37
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