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(15x-2)+(7x-4)=90
We move all terms to the left:
(15x-2)+(7x-4)-(90)=0
We get rid of parentheses
15x+7x-2-4-90=0
We add all the numbers together, and all the variables
22x-96=0
We move all terms containing x to the left, all other terms to the right
22x=96
x=96/22
x=4+4/11
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