21=-3(a-3)

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Solution for 21=-3(a-3) equation:



21=-3(a-3)
We move all terms to the left:
21-(-3(a-3))=0
We calculate terms in parentheses: -(-3(a-3)), so:
-3(a-3)
We multiply parentheses
-3a+9
Back to the equation:
-(-3a+9)
We get rid of parentheses
3a-9+21=0
We add all the numbers together, and all the variables
3a+12=0
We move all terms containing a to the left, all other terms to the right
3a=-12
a=-12/3
a=-4

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