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5+(x+54)=90
We move all terms to the left:
5+(x+54)-(90)=0
We add all the numbers together, and all the variables
(x+54)-85=0
We get rid of parentheses
x+54-85=0
We add all the numbers together, and all the variables
x-31=0
We move all terms containing x to the left, all other terms to the right
x=31
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