21-9c=-3(4c+5)

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Solution for 21-9c=-3(4c+5) equation:


Simplifying
21 + -9c = -3(4c + 5)

Reorder the terms:
21 + -9c = -3(5 + 4c)
21 + -9c = (5 * -3 + 4c * -3)
21 + -9c = (-15 + -12c)

Solving
21 + -9c = -15 + -12c

Solving for variable 'c'.

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

Add '12c' to each side of the equation.
21 + -9c + 12c = -15 + -12c + 12c

Combine like terms: -9c + 12c = 3c
21 + 3c = -15 + -12c + 12c

Combine like terms: -12c + 12c = 0
21 + 3c = -15 + 0
21 + 3c = -15

Add '-21' to each side of the equation.
21 + -21 + 3c = -15 + -21

Combine like terms: 21 + -21 = 0
0 + 3c = -15 + -21
3c = -15 + -21

Combine like terms: -15 + -21 = -36
3c = -36

Divide each side by '3'.
c = -12

Simplifying
c = -12

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