15=8c-9

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Solution for 15=8c-9 equation:


Simplifying
15 = 8c + -9

Reorder the terms:
15 = -9 + 8c

Solving
15 = -9 + 8c

Solving for variable 'c'.

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

Add '-8c' to each side of the equation.
15 + -8c = -9 + 8c + -8c

Combine like terms: 8c + -8c = 0
15 + -8c = -9 + 0
15 + -8c = -9

Add '-15' to each side of the equation.
15 + -15 + -8c = -9 + -15

Combine like terms: 15 + -15 = 0
0 + -8c = -9 + -15
-8c = -9 + -15

Combine like terms: -9 + -15 = -24
-8c = -24

Divide each side by '-8'.
c = 3

Simplifying
c = 3

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