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X=90+(6X)
We move all terms to the left:
X-(90+(6X))=0
We add all the numbers together, and all the variables
X-(6X+90)=0
We get rid of parentheses
X-6X-90=0
We add all the numbers together, and all the variables
-5X-90=0
We move all terms containing X to the left, all other terms to the right
-5X=90
X=90/-5
X=-18
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