21=-x/4

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Solution for 21=-x/4 equation: 



21=-x/4

We move all terms to the left:

21-(-x/4)=0

We get rid of parentheses

x/4+21=0

We multiply all the terms by the denominator


x+21*4=0

We add all the numbers together, and all the variables

x+84=0

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

x=-84

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