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-42=-x/9
We move all terms to the left:
-42-(-x/9)=0
We get rid of parentheses
x/9-42=0
We multiply all the terms by the denominator
x-42*9=0
We add all the numbers together, and all the variables
x-378=0
We move all terms containing x to the left, all other terms to the right
x=378
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