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(3x+1)+(x+3)=90
We move all terms to the left:
(3x+1)+(x+3)-(90)=0
We get rid of parentheses
3x+x+1+3-90=0
We add all the numbers together, and all the variables
4x-86=0
We move all terms containing x to the left, all other terms to the right
4x=86
x=86/4
x=21+1/2
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