21=x/3-15

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Solution for 21=x/3-15 equation: 



21=x/3-15

We move all terms to the left:

21-(x/3-15)=0

We get rid of parentheses

-x/3+15+21=0

We multiply all the terms by the denominator


-x+15*3+21*3=0

We add all the numbers together, and all the variables

-1x+108=0

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

-x=-108

x=-108/-1

x=+108

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