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-x-5(1-7x)=131
We move all terms to the left:
-x-5(1-7x)-(131)=0
We add all the numbers together, and all the variables
-x-5(-7x+1)-131=0
We add all the numbers together, and all the variables
-1x-5(-7x+1)-131=0
We multiply parentheses
-1x+35x-5-131=0
We add all the numbers together, and all the variables
34x-136=0
We move all terms containing x to the left, all other terms to the right
34x=136
x=136/34
x=4
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