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(4x-3)+(3x-9)=90
We move all terms to the left:
(4x-3)+(3x-9)-(90)=0
We get rid of parentheses
4x+3x-3-9-90=0
We add all the numbers together, and all the variables
7x-102=0
We move all terms containing x to the left, all other terms to the right
7x=102
x=102/7
x=14+4/7
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