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(3x+1)31=90
We move all terms to the left:
(3x+1)31-(90)=0
We multiply parentheses
93x+31-90=0
We add all the numbers together, and all the variables
93x-59=0
We move all terms containing x to the left, all other terms to the right
93x=59
x=59/93
x=59/93
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