-15+3x=21+x

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Solution for -15+3x=21+x equation: 



-15+3x=21+x

We move all terms to the left:

-15+3x-(21+x)=0

We add all the numbers together, and all the variables

3x-(x+21)-15=0

We get rid of parentheses

3x-x-21-15=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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