(x+3x)*2=320

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Solution for (x+3x)*2=320 equation: 



(x+3x)*2=320

We move all terms to the left:

(x+3x)*2-(320)=0

We add all the numbers together, and all the variables

(+4x)*2-320=0

We multiply parentheses

8x-320=0

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

8x=320

x=320/8

x=40

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