x+x+40=320

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Solution for x+x+40=320 equation: 



x+x+40=320

We move all terms to the left:

x+x+40-(320)=0

We add all the numbers together, and all the variables

2x-280=0

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

2x=280

x=280/2

x=140

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