31=3x+5x+7

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Solution for 31=3x+5x+7 equation: 



31=3x+5x+7

We move all terms to the left:

31-(3x+5x+7)=0

We add all the numbers together, and all the variables

-(8x+7)+31=0

We get rid of parentheses

-8x-7+31=0

We add all the numbers together, and all the variables

-8x+24=0

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

-8x=-24

x=-24/-8

x=+3

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