15=3x+4x

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Solution for 15=3x+4x equation: 



15=3x+4x

We move all terms to the left:

15-(3x+4x)=0

We add all the numbers together, and all the variables

-(+7x)+15=0

We get rid of parentheses

-7x+15=0

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

-7x=-15

x=-15/-7

x=2+1/7

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