3(a-9)=21

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Solution for 3(a-9)=21 equation: 


Simplifying
3(a + -9) = 21

Reorder the terms:
3(-9 + a) = 21
(-9 * 3 + a * 3) = 21
(-27 + 3a) = 21

Solving
-27 + 3a = 21

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '27' to each side of the equation.
-27 + 27 + 3a = 21 + 27

Combine like terms: -27 + 27 = 0
0 + 3a = 21 + 27
3a = 21 + 27

Combine like terms: 21 + 27 = 48
3a = 48

Divide each side by '3'.
a = 16

Simplifying
a = 16

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