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(2x+1)+(2x+5)+(90)=180
We move all terms to the left:
(2x+1)+(2x+5)+(90)-(180)=0
We add all the numbers together, and all the variables
(2x+1)+(2x+5)-90=0
We get rid of parentheses
2x+2x+1+5-90=0
We add all the numbers together, and all the variables
4x-84=0
We move all terms containing x to the left, all other terms to the right
4x=84
x=84/4
x=21
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