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9x-9=(90-9x)+27
We move all terms to the left:
9x-9-((90-9x)+27)=0
We add all the numbers together, and all the variables
9x-((-9x+90)+27)-9=0
We calculate terms in parentheses: -((-9x+90)+27), so:We get rid of parentheses
(-9x+90)+27
We get rid of parentheses
-9x+90+27
We add all the numbers together, and all the variables
-9x+117
Back to the equation:
-(-9x+117)
9x+9x-117-9=0
We add all the numbers together, and all the variables
18x-126=0
We move all terms containing x to the left, all other terms to the right
18x=126
x=126/18
x=7
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