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x+(3x-40)+4x+(3x-40)=
We move all terms to the left:
x+(3x-40)+4x+(3x-40)-()=0
We add all the numbers together, and all the variables
5x+(3x-40)+(3x-40)=0
We get rid of parentheses
5x+3x+3x-40-40=0
We add all the numbers together, and all the variables
11x-80=0
We move all terms containing x to the left, all other terms to the right
11x=80
x=80/11
x=7+3/11
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