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(3x+40)+(4x)=360
We move all terms to the left:
(3x+40)+(4x)-(360)=0
We add all the numbers together, and all the variables
4x+(3x+40)-360=0
We get rid of parentheses
4x+3x+40-360=0
We add all the numbers together, and all the variables
7x-320=0
We move all terms containing x to the left, all other terms to the right
7x=320
x=320/7
x=45+5/7
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