15=9x-4x

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Solution for 15=9x-4x equation: 



15=9x-4x

We move all terms to the left:

15-(9x-4x)=0

We add all the numbers together, and all the variables

-(+5x)+15=0

We get rid of parentheses

-5x+15=0

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

-5x=-15

x=-15/-5

x=+3

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