3*7=15+x

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Solution for 3*7=15+x equation: 



3*7=15+x

We move all terms to the left:

3*7-(15+x)=0

We add all the numbers together, and all the variables

-(x+15)+3*7=0

We add all the numbers together, and all the variables

-(x+15)+21=0

We get rid of parentheses

-x-15+21=0

We add all the numbers together, and all the variables

-1x+6=0

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

-x=-6

x=-6/-1

x=+6

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