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(5+2x)+(4x+1)=90
We move all terms to the left:
(5+2x)+(4x+1)-(90)=0
We add all the numbers together, and all the variables
(2x+5)+(4x+1)-90=0
We get rid of parentheses
2x+4x+5+1-90=0
We add all the numbers together, and all the variables
6x-84=0
We move all terms containing x to the left, all other terms to the right
6x=84
x=84/6
x=14
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