21=1/2a+1

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Solution for 21=1/2a+1 equation: 



21=1/2a+1

We move all terms to the left:

21-(1/2a+1)=0



Domain of the equation: 2a+1)!=0

a∈R



We get rid of parentheses

-1/2a-1+21=0

We multiply all the terms by the denominator


-1*2a+21*2a-1=0

Wy multiply elements

-2a+42a-1=0

We add all the numbers together, and all the variables

40a-1=0

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

40a=1

a=1/40

a=1/40

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