5(3-8a)=21

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Solution for 5(3-8a)=21 equation: 


Simplifying
5(3 + -8a) = 21
(3 * 5 + -8a * 5) = 21
(15 + -40a) = 21

Solving
15 + -40a = 21

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + -40a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -40a = 21 + -15
-40a = 21 + -15

Combine like terms: 21 + -15 = 6
-40a = 6

Divide each side by '-40'.
a = -0.15

Simplifying
a = -0.15

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