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90=57(x+23)
We move all terms to the left:
90-(57(x+23))=0
We calculate terms in parentheses: -(57(x+23)), so:We get rid of parentheses
57(x+23)
We multiply parentheses
57x+1311
Back to the equation:
-(57x+1311)
-57x-1311+90=0
We add all the numbers together, and all the variables
-57x-1221=0
We move all terms containing x to the left, all other terms to the right
-57x=1221
x=1221/-57
x=-21+8/19
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