9-7(a-2)=21

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Solution for 9-7(a-2)=21 equation: 



9-7(a-2)=21

We move all terms to the left:

9-7(a-2)-(21)=0

We add all the numbers together, and all the variables

-7(a-2)-12=0

We multiply parentheses

-7a+14-12=0

We add all the numbers together, and all the variables

-7a+2=0

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

-7a=-2

a=-2/-7

a=2/7

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