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9x-(x-9)=2x-(+x)
We move all terms to the left:
9x-(x-9)-(2x-(+x))=0
We get rid of parentheses
9x-x-(2x-(+x))+9=0
We calculate terms in parentheses: -(2x-(+x)), so:We add all the numbers together, and all the variables
2x-(+x)
We get rid of parentheses
2x-x
We add all the numbers together, and all the variables
x
Back to the equation:
-(x)
7x+9=0
We move all terms containing x to the left, all other terms to the right
7x=-9
x=-9/7
x=-1+2/7
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