21=-7/9w

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Solution for 21=-7/9w equation: 



21=-7/9w

We move all terms to the left:

21-(-7/9w)=0



Domain of the equation: 9w)!=0

w!=0/1

w!=0

w∈R



We get rid of parentheses

7/9w+21=0

We multiply all the terms by the denominator


21*9w+7=0

Wy multiply elements

189w+7=0

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

189w=-7

w=-7/189

w=-1/27

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