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90=x+(x+36)
We move all terms to the left:
90-(x+(x+36))=0
We calculate terms in parentheses: -(x+(x+36)), so:We get rid of parentheses
x+(x+36)
We get rid of parentheses
x+x+36
We add all the numbers together, and all the variables
2x+36
Back to the equation:
-(2x+36)
-2x-36+90=0
We add all the numbers together, and all the variables
-2x+54=0
We move all terms containing x to the left, all other terms to the right
-2x=-54
x=-54/-2
x=+27
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