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66+(31x-7)=90
We move all terms to the left:
66+(31x-7)-(90)=0
We add all the numbers together, and all the variables
(31x-7)-24=0
We get rid of parentheses
31x-7-24=0
We add all the numbers together, and all the variables
31x-31=0
We move all terms containing x to the left, all other terms to the right
31x=31
x=31/31
x=1
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