15=21+2x

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Solution for 15=21+2x equation: 



15=21+2x

We move all terms to the left:

15-(21+2x)=0

We add all the numbers together, and all the variables

-(2x+21)+15=0

We get rid of parentheses

-2x-21+15=0

We add all the numbers together, and all the variables

-2x-6=0

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

-2x=6

x=6/-2

x=-3

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