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7-13x=-7x-7x
We move all terms to the left:
7-13x-(-7x-7x)=0
We add all the numbers together, and all the variables
-13x-(-14x)+7=0
We get rid of parentheses
-13x+14x+7=0
We add all the numbers together, and all the variables
x+7=0
We move all terms containing x to the left, all other terms to the right
x=-7
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