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-35=-42-7x
We move all terms to the left:
-35-(-42-7x)=0
We add all the numbers together, and all the variables
-(-7x-42)-35=0
We get rid of parentheses
7x+42-35=0
We add all the numbers together, and all the variables
7x+7=0
We move all terms containing x to the left, all other terms to the right
7x=-7
x=-7/7
x=-1
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