5(a+3)=21

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Solution for 5(a+3)=21 equation: 


Simplifying
5(a + 3) = 21

Reorder the terms:
5(3 + a) = 21
(3 * 5 + a * 5) = 21
(15 + 5a) = 21

Solving
15 + 5a = 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 + 5a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 5a = 21 + -15
5a = 21 + -15

Combine like terms: 21 + -15 = 6
5a = 6

Divide each side by '5'.
a = 1.2

Simplifying
a = 1.2

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