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3+7x/3=-18
We move all terms to the left:
3+7x/3-(-18)=0
We add all the numbers together, and all the variables
7x/3+21=0
We multiply all the terms by the denominator
7x+21*3=0
We add all the numbers together, and all the variables
7x+63=0
We move all terms containing x to the left, all other terms to the right
7x=-63
x=-63/7
x=-9
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