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(2x+30)+2x=90
We move all terms to the left:
(2x+30)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(2x+30)-90=0
We get rid of parentheses
2x+2x+30-90=0
We add all the numbers together, and all the variables
4x-60=0
We move all terms containing x to the left, all other terms to the right
4x=60
x=60/4
x=15
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