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(5x+4)+(2x)=90
We move all terms to the left:
(5x+4)+(2x)-(90)=0
We add all the numbers together, and all the variables
2x+(5x+4)-90=0
We get rid of parentheses
2x+5x+4-90=0
We add all the numbers together, and all the variables
7x-86=0
We move all terms containing x to the left, all other terms to the right
7x=86
x=86/7
x=12+2/7
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