21=x/3+4

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Solution for 21=x/3+4 equation: 



21=x/3+4

We move all terms to the left:

21-(x/3+4)=0

We get rid of parentheses

-x/3-4+21=0

We multiply all the terms by the denominator


-x-4*3+21*3=0

We add all the numbers together, and all the variables

-1x+51=0

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

-x=-51

x=-51/-1

x=+51

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