3(a+1)=15

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Solution for 3(a+1)=15 equation: 


Simplifying
3(a + 1) = 15

Reorder the terms:
3(1 + a) = 15
(1 * 3 + a * 3) = 15
(3 + 3a) = 15

Solving
3 + 3a = 15

Solving for variable 'a'.

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

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

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

Combine like terms: 15 + -3 = 12
3a = 12

Divide each side by '3'.
a = 4

Simplifying
a = 4

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