x+5x+7x=20

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Solution for x+5x+7x=20 equation: 



x+5x+7x=20

We move all terms to the left:

x+5x+7x-(20)=0

We add all the numbers together, and all the variables

13x-20=0

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

13x=20

x=20/13

x=1+7/13

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