1/5*(x+21)=4

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Solution for 1/5*(x+21)=4 equation: 



1/5(x+21)=4

We move all terms to the left:

1/5(x+21)-(4)=0



Domain of the equation: 5(x+21)!=0

x∈R



We multiply all the terms by the denominator


-4*5(x+21)+1=0

Wy multiply elements

-20x(x+1=0

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