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(2x+1)+(x+-181)=90
We move all terms to the left:
(2x+1)+(x+-181)-(90)=0
We add all the numbers together, and all the variables
(2x+1)+(x-181)-90=0
We get rid of parentheses
2x+x+1-181-90=0
We add all the numbers together, and all the variables
3x-270=0
We move all terms containing x to the left, all other terms to the right
3x=270
x=270/3
x=90
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