-a/7=21

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Solution for -a/7=21 equation: 



-a/7=21

We move all terms to the left:

-a/7-(21)=0

We multiply all the terms by the denominator


-a-21*7=0

We add all the numbers together, and all the variables

-1a-147=0

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

-a=147

a=147/-1

a=-147

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