21=x/5+3

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Solution for 21=x/5+3 equation: 



21=x/5+3

We move all terms to the left:

21-(x/5+3)=0

We get rid of parentheses

-x/5-3+21=0

We multiply all the terms by the denominator


-x-3*5+21*5=0

We add all the numbers together, and all the variables

-1x+90=0

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

-x=-90

x=-90/-1

x=+90

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