3-a/7=0

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Solution for 3-a/7=0 equation: 



3-a/7=0

We multiply all the terms by the denominator


-a+3*7=0

We add all the numbers together, and all the variables

-1a+21=0

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

-a=-21

a=-21/-1

a=+21

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