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2x+90=125+-7x
We move all terms to the left:
2x+90-(125+-7x)=0
We add all the numbers together, and all the variables
2x-(-7x)+90=0
We get rid of parentheses
2x+7x+90=0
We add all the numbers together, and all the variables
9x+90=0
We move all terms containing x to the left, all other terms to the right
9x=-90
x=-90/9
x=-10
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