51-a=21+a

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Solution for 51-a=21+a equation: 



51-a=21+a

We move all terms to the left:

51-a-(21+a)=0

We add all the numbers together, and all the variables

-a-(a+21)+51=0

We add all the numbers together, and all the variables

-1a-(a+21)+51=0

We get rid of parentheses

-1a-a-21+51=0

We add all the numbers together, and all the variables

-2a+30=0

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

-2a=-30

a=-30/-2

a=+15

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