9(1-3a)=21

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Solution for 9(1-3a)=21 equation: 


Simplifying
9(1 + -3a) = 21
(1 * 9 + -3a * 9) = 21
(9 + -27a) = 21

Solving
9 + -27a = 21

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + -27a = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -27a = 21 + -9
-27a = 21 + -9

Combine like terms: 21 + -9 = 12
-27a = 12

Divide each side by '-27'.
a = -0.4444444444

Simplifying
a = -0.4444444444

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