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52+(x-13)=90
We move all terms to the left:
52+(x-13)-(90)=0
We add all the numbers together, and all the variables
(x-13)-38=0
We get rid of parentheses
x-13-38=0
We add all the numbers together, and all the variables
x-51=0
We move all terms containing x to the left, all other terms to the right
x=51
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