21=-7/4x

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Solution for 21=-7/4x equation: 



21=-7/4x

We move all terms to the left:

21-(-7/4x)=0



Domain of the equation: 4x)!=0

x!=0/1

x!=0

x∈R



We get rid of parentheses

7/4x+21=0

We multiply all the terms by the denominator


21*4x+7=0

Wy multiply elements

84x+7=0

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

84x=-7

x=-7/84

x=-1/12

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