1/2*x=21

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Solution for 1/2*x=21 equation: 



1/2x=21

We move all terms to the left:

1/2x-(21)=0



Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R



We multiply all the terms by the denominator


-21*2x+1=0

Wy multiply elements

-42x+1=0

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

-42x=-1

x=-1/-42

x=1/42

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