3(-1+a)=-15

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


Simplifying
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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