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3x=-18+2x-45
We move all terms to the left:
3x-(-18+2x-45)=0
We add all the numbers together, and all the variables
3x-(2x-63)=0
We get rid of parentheses
3x-2x+63=0
We add all the numbers together, and all the variables
x+63=0
We move all terms containing x to the left, all other terms to the right
x=-63
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