a-9/21=-1

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Solution for a-9/21=-1 equation: 



a-9/21=-1

We move all terms to the left:

a-9/21-(-1)=0

We add all the numbers together, and all the variables

a+1-9/21=0

We multiply all the terms by the denominator


a*21-9+1*21=0

We add all the numbers together, and all the variables

a*21+12=0

Wy multiply elements

21a+12=0

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

21a=-12

a=-12/21

a=-4/7

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