15=3x+2x+20

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Solution for 15=3x+2x+20 equation: 



15=3x+2x+20

We move all terms to the left:

15-(3x+2x+20)=0

We add all the numbers together, and all the variables

-(5x+20)+15=0

We get rid of parentheses

-5x-20+15=0

We add all the numbers together, and all the variables

-5x-5=0

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

-5x=5

x=5/-5

x=-1

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