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(2x+15)+2x=90
We move all terms to the left:
(2x+15)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(2x+15)-90=0
We get rid of parentheses
2x+2x+15-90=0
We add all the numbers together, and all the variables
4x-75=0
We move all terms containing x to the left, all other terms to the right
4x=75
x=75/4
x=18+3/4
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