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-2(x-13)=40
We move all terms to the left:
-2(x-13)-(40)=0
We multiply parentheses
-2x+26-40=0
We add all the numbers together, and all the variables
-2x-14=0
We move all terms containing x to the left, all other terms to the right
-2x=14
x=14/-2
x=-7
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