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7x-100=-7x+-2
We move all terms to the left:
7x-100-(-7x+-2)=0
We add all the numbers together, and all the variables
7x-(-7x-2)-100=0
We get rid of parentheses
7x+7x+2-100=0
We add all the numbers together, and all the variables
14x-98=0
We move all terms containing x to the left, all other terms to the right
14x=98
x=98/14
x=7
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