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-1(1+7x)-6(-7-x)=13
We move all terms to the left:
-1(1+7x)-6(-7-x)-(13)=0
We add all the numbers together, and all the variables
-1(7x+1)-6(-1x-7)-13=0
We multiply parentheses
-1(7x+1)+6x+42-13=0
We add all the numbers together, and all the variables
6x-1(7x+1)+29=0
We move all terms containing x to the left, all other terms to the right
6x-1(7x+1)=-29
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