7+15=7x+21

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Solution for 7+15=7x+21 equation: 



7+15=7x+21

We move all terms to the left:

7+15-(7x+21)=0

We add all the numbers together, and all the variables

-(7x+21)+22=0

We get rid of parentheses

-7x-21+22=0

We add all the numbers together, and all the variables

-7x+1=0

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

-7x=-1

x=-1/-7

x=1/7

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