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5x=9-3x+18+15
We move all terms to the left:
5x-(9-3x+18+15)=0
We add all the numbers together, and all the variables
5x-(-3x+42)=0
We get rid of parentheses
5x+3x-42=0
We add all the numbers together, and all the variables
8x-42=0
We move all terms containing x to the left, all other terms to the right
8x=42
x=42/8
x=5+1/4
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