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3x+(x+26)=90
We move all terms to the left:
3x+(x+26)-(90)=0
We get rid of parentheses
3x+x+26-90=0
We add all the numbers together, and all the variables
4x-64=0
We move all terms containing x to the left, all other terms to the right
4x=64
x=64/4
x=16
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