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39+(2x+1)=90
We move all terms to the left:
39+(2x+1)-(90)=0
We add all the numbers together, and all the variables
(2x+1)-51=0
We get rid of parentheses
2x+1-51=0
We add all the numbers together, and all the variables
2x-50=0
We move all terms containing x to the left, all other terms to the right
2x=50
x=50/2
x=25
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