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(15x-2)+7x+4)=90
We move all terms to the left:
(15x-2)+7x+4)-(90)=0
We add all the numbers together, and all the variables
7x+(15x-2)=0
We get rid of parentheses
7x+15x-2=0
We add all the numbers together, and all the variables
22x-2=0
We move all terms containing x to the left, all other terms to the right
22x=2
x=2/22
x=1/11
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