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(4x+6)+(9x+6)=90
We move all terms to the left:
(4x+6)+(9x+6)-(90)=0
We get rid of parentheses
4x+9x+6+6-90=0
We add all the numbers together, and all the variables
13x-78=0
We move all terms containing x to the left, all other terms to the right
13x=78
x=78/13
x=6
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