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18=-7x+5x
We move all terms to the left:
18-(-7x+5x)=0
We add all the numbers together, and all the variables
-(-2x)+18=0
We get rid of parentheses
2x+18=0
We move all terms containing x to the left, all other terms to the right
2x=-18
x=-18/2
x=-9
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