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66+(5x+9)=90
We move all terms to the left:
66+(5x+9)-(90)=0
We add all the numbers together, and all the variables
(5x+9)-24=0
We get rid of parentheses
5x+9-24=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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