3(a+5)=21

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


Simplifying
3(a + 5) = 21

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

Solving
15 + 3a = 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 + 3a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 3a = 21 + -15
3a = 21 + -15

Combine like terms: 21 + -15 = 6
3a = 6

Divide each side by '3'.
a = 2

Simplifying
a = 2

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