21=x/8=7

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Solution for 21=x/8=7 equation: 



21=x/8=7

We move all terms to the left:

21-(x/8)=0

We add all the numbers together, and all the variables

-(+x/8)+21=0

We get rid of parentheses

-x/8+21=0

We multiply all the terms by the denominator


-x+21*8=0

We add all the numbers together, and all the variables

-1x+168=0

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

-x=-168

x=-168/-1

x=+168

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