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-140=13x+10
We move all terms to the left:
-140-(13x+10)=0
We get rid of parentheses
-13x-10-140=0
We add all the numbers together, and all the variables
-13x-150=0
We move all terms containing x to the left, all other terms to the right
-13x=150
x=150/-13
x=-11+7/13
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