19=12-7,a

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Solution for 19=12-7,a equation: 



19=12-7.a

We move all terms to the left:

19-(12-7.a)=0

We add all the numbers together, and all the variables

-(-7a+12)+19=0

We get rid of parentheses

7a-12+19=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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