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-6(x-13)=-42
We move all terms to the left:
-6(x-13)-(-42)=0
We add all the numbers together, and all the variables
-6(x-13)+42=0
We multiply parentheses
-6x+78+42=0
We add all the numbers together, and all the variables
-6x+120=0
We move all terms containing x to the left, all other terms to the right
-6x=-120
x=-120/-6
x=+20
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