-3(4-a)=-15

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Solution for -3(4-a)=-15 equation: 


Simplifying
-3(4 + -1a) = -15
(4 * -3 + -1a * -3) = -15
(-12 + 3a) = -15

Solving
-12 + 3a = -15

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + 3a = -15 + 12

Combine like terms: -12 + 12 = 0
0 + 3a = -15 + 12
3a = -15 + 12

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

Divide each side by '3'.
a = -1

Simplifying
a = -1

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