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(2x+13)+75=90
We move all terms to the left:
(2x+13)+75-(90)=0
We add all the numbers together, and all the variables
(2x+13)-15=0
We get rid of parentheses
2x+13-15=0
We add all the numbers together, and all the variables
2x-2=0
We move all terms containing x to the left, all other terms to the right
2x=2
x=2/2
x=1
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