15=3(c-1)+9

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Solution for 15=3(c-1)+9 equation:


Simplifying
15 = 3(c + -1) + 9

Reorder the terms:
15 = 3(-1 + c) + 9
15 = (-1 * 3 + c * 3) + 9
15 = (-3 + 3c) + 9

Reorder the terms:
15 = -3 + 9 + 3c

Combine like terms: -3 + 9 = 6
15 = 6 + 3c

Solving
15 = 6 + 3c

Solving for variable 'c'.

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

Add '-3c' to each side of the equation.
15 + -3c = 6 + 3c + -3c

Combine like terms: 3c + -3c = 0
15 + -3c = 6 + 0
15 + -3c = 6

Add '-15' to each side of the equation.
15 + -15 + -3c = 6 + -15

Combine like terms: 15 + -15 = 0
0 + -3c = 6 + -15
-3c = 6 + -15

Combine like terms: 6 + -15 = -9
-3c = -9

Divide each side by '-3'.
c = 3

Simplifying
c = 3

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