x+x+40x=320

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Solution for x+x+40x=320 equation: 



x+x+40x=320

We move all terms to the left:

x+x+40x-(320)=0

We add all the numbers together, and all the variables

42x-320=0

We move all terms containing x to the left, all other terms to the right

42x=320

x=320/42

x=7+13/21

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