21+19a=28+12a

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Solution for 21+19a=28+12a equation: 



21+19a=28+12a

We move all terms to the left:

21+19a-(28+12a)=0

We add all the numbers together, and all the variables

19a-(12a+28)+21=0

We get rid of parentheses

19a-12a-28+21=0

We add all the numbers together, and all the variables

7a-7=0

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

7a=7

a=7/7

a=1

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