9(1-6a)=21

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Solution for 9(1-6a)=21 equation: 


Simplifying
9(1 + -6a) = 21
(1 * 9 + -6a * 9) = 21
(9 + -54a) = 21

Solving
9 + -54a = 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 + -54a = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -54a = 21 + -9
-54a = 21 + -9

Combine like terms: 21 + -9 = 12
-54a = 12

Divide each side by '-54'.
a = -0.2222222222

Simplifying
a = -0.2222222222

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