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(4+2x)+(3x+1)=90
We move all terms to the left:
(4+2x)+(3x+1)-(90)=0
We add all the numbers together, and all the variables
(2x+4)+(3x+1)-90=0
We get rid of parentheses
2x+3x+4+1-90=0
We add all the numbers together, and all the variables
5x-85=0
We move all terms containing x to the left, all other terms to the right
5x=85
x=85/5
x=17
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