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42=-x/7+28
We move all terms to the left:
42-(-x/7+28)=0
We get rid of parentheses
x/7-28+42=0
We multiply all the terms by the denominator
x-28*7+42*7=0
We add all the numbers together, and all the variables
x+98=0
We move all terms containing x to the left, all other terms to the right
x=-98
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