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(x+18)+(2x)=90
We move all terms to the left:
(x+18)+(2x)-(90)=0
We add all the numbers together, and all the variables
2x+(x+18)-90=0
We get rid of parentheses
2x+x+18-90=0
We add all the numbers together, and all the variables
3x-72=0
We move all terms containing x to the left, all other terms to the right
3x=72
x=72/3
x=24
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