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7x-15=3x+18+x+6
We move all terms to the left:
7x-15-(3x+18+x+6)=0
We add all the numbers together, and all the variables
7x-(4x+24)-15=0
We get rid of parentheses
7x-4x-24-15=0
We add all the numbers together, and all the variables
3x-39=0
We move all terms containing x to the left, all other terms to the right
3x=39
x=39/3
x=13
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