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-7x-(-13x)=18
We move all terms to the left:
-7x-(-13x)-(18)=0
We get rid of parentheses
-7x+13x-18=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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