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(13+x)+62=90
We move all terms to the left:
(13+x)+62-(90)=0
We add all the numbers together, and all the variables
(x+13)+62-90=0
We add all the numbers together, and all the variables
(x+13)-28=0
We get rid of parentheses
x+13-28=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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