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-2x-7(3x+8)=13
We move all terms to the left:
-2x-7(3x+8)-(13)=0
We multiply parentheses
-2x-21x-56-13=0
We add all the numbers together, and all the variables
-23x-69=0
We move all terms containing x to the left, all other terms to the right
-23x=69
x=69/-23
x=-3
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