3(a+5)=a+21

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


Simplifying
3(a + 5) = a + 21

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

Reorder the terms:
15 + 3a = 21 + a

Solving
15 + 3a = 21 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
15 + 3a + -1a = 21 + a + -1a

Combine like terms: 3a + -1a = 2a
15 + 2a = 21 + a + -1a

Combine like terms: a + -1a = 0
15 + 2a = 21 + 0
15 + 2a = 21

Add '-15' to each side of the equation.
15 + -15 + 2a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2a = 21 + -15
2a = 21 + -15

Combine like terms: 21 + -15 = 6
2a = 6

Divide each side by '2'.
a = 3

Simplifying
a = 3

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