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7x-18=-5x=18
We move all terms to the left:
7x-18-(-5x)=0
We get rid of parentheses
7x+5x-18=0
We add all the numbers together, and all the variables
12x-18=0
We move all terms containing x to the left, all other terms to the right
12x=18
x=18/12
x=1+1/2
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