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(5x+40)+2x=90
We move all terms to the left:
(5x+40)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(5x+40)-90=0
We get rid of parentheses
2x+5x+40-90=0
We add all the numbers together, and all the variables
7x-50=0
We move all terms containing x to the left, all other terms to the right
7x=50
x=50/7
x=7+1/7
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