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(2x)+(x+48)=90
We move all terms to the left:
(2x)+(x+48)-(90)=0
We get rid of parentheses
2x+x+48-90=0
We add all the numbers together, and all the variables
3x-42=0
We move all terms containing x to the left, all other terms to the right
3x=42
x=42/3
x=14
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