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xx13-133=xx4-7
We move all terms to the left:
xx13-133-(xx4-7)=0
We get rid of parentheses
xx13-xx4+7-133=0
We add all the numbers together, and all the variables
xx13-xx4-126=0
We move all terms containing x to the left, all other terms to the right
xx13-xx4=126
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