3(a+5)=42

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Solution for 3(a+5)=42 equation: 


Simplifying
3(a + 5) = 42

Reorder the terms:
3(5 + a) = 42
(5 * 3 + a * 3) = 42
(15 + 3a) = 42

Solving
15 + 3a = 42

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 = 42 + -15

Combine like terms: 15 + -15 = 0
0 + 3a = 42 + -15
3a = 42 + -15

Combine like terms: 42 + -15 = 27
3a = 27

Divide each side by '3'.
a = 9

Simplifying
a = 9

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