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21=-7/9w
We move all terms to the left:
21-(-7/9w)=0
Domain of the equation: 9w)!=0We get rid of parentheses
w!=0/1
w!=0
w∈R
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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