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-13x-4x=x+7
We move all terms to the left:
-13x-4x-(x+7)=0
We add all the numbers together, and all the variables
-17x-(x+7)=0
We get rid of parentheses
-17x-x-7=0
We add all the numbers together, and all the variables
-18x-7=0
We move all terms containing x to the left, all other terms to the right
-18x=7
x=7/-18
x=-7/18
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