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3x+15=18-2x
We move all terms to the left:
3x+15-(18-2x)=0
We add all the numbers together, and all the variables
3x-(-2x+18)+15=0
We get rid of parentheses
3x+2x-18+15=0
We add all the numbers together, and all the variables
5x-3=0
We move all terms containing x to the left, all other terms to the right
5x=3
x=3/5
x=3/5
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