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13+2x=(-x+9)-81
We move all terms to the left:
13+2x-((-x+9)-81)=0
We add all the numbers together, and all the variables
2x-((-1x+9)-81)+13=0
We calculate terms in parentheses: -((-1x+9)-81), so:We get rid of parentheses
(-1x+9)-81
We get rid of parentheses
-1x+9-81
We add all the numbers together, and all the variables
-1x-72
Back to the equation:
-(-1x-72)
2x+1x+72+13=0
We add all the numbers together, and all the variables
3x+85=0
We move all terms containing x to the left, all other terms to the right
3x=-85
x=-85/3
x=-28+1/3
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