15=-3(c-1)+a

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


Simplifying
15 = -3(c + -1) + a

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

Reorder the terms:
15 = 3 + a + -3c

Solving
15 = 3 + a + -3c

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 + -1a = 3 + a + -1a + -3c

Combine like terms: a + -1a = 0
15 + -1a = 3 + 0 + -3c
15 + -1a = 3 + -3c

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

Combine like terms: 15 + -15 = 0
0 + -1a = 3 + -15 + -3c
-1a = 3 + -15 + -3c

Combine like terms: 3 + -15 = -12
-1a = -12 + -3c

Divide each side by '-1'.
a = 12 + 3c

Simplifying
a = 12 + 3c

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