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5x-(-3x)=18
We move all terms to the left:
5x-(-3x)-(18)=0
We get rid of parentheses
5x+3x-18=0
We add all the numbers together, and all the variables
8x-18=0
We move all terms containing x to the left, all other terms to the right
8x=18
x=18/8
x=2+1/4
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