15-3c-12=5+c

Solution for 15-3c-12=5+c equation:

Simplifying
15 + -3c + -12 = 5 + c

Reorder the terms:
15 + -12 + -3c = 5 + c

Combine like terms: 15 + -12 = 3
3 + -3c = 5 + c

Solving
3 + -3c = 5 + c

Solving for variable 'c'.

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

Add '-1c' to each side of the equation.
3 + -3c + -1c = 5 + c + -1c

Combine like terms: -3c + -1c = -4c
3 + -4c = 5 + c + -1c

Combine like terms: c + -1c = 0
3 + -4c = 5 + 0
3 + -4c = 5

Add '-3' to each side of the equation.
3 + -3 + -4c = 5 + -3

Combine like terms: 3 + -3 = 0
0 + -4c = 5 + -3
-4c = 5 + -3

Combine like terms: 5 + -3 = 2
-4c = 2

Divide each side by '-4'.
c = -0.5

Simplifying
c = -0.5