3x-15+x=x+21

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



3x-15+x=x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(x+21)-15=0

We get rid of parentheses

4x-x-21-15=0

We add all the numbers together, and all the variables

3x-36=0

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

3x=36

x=36/3

x=12

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