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x-7=-13x=
We move all terms to the left:
x-7-(-13x)=0
We get rid of parentheses
x+13x-7=0
We add all the numbers together, and all the variables
14x-7=0
We move all terms containing x to the left, all other terms to the right
14x=7
x=7/14
x=1/2
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