7=4x+8x

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Solution for 7=4x+8x equation: 



7=4x+8x

We move all terms to the left:

7-(4x+8x)=0

We add all the numbers together, and all the variables

-(+12x)+7=0

We get rid of parentheses

-12x+7=0

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

-12x=-7

x=-7/-12

x=7/12

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