18-15=2c+6

Solution for 18-15=2c+6 equation:

Simplifying
18 + -15 = 2c + 6

Combine like terms: 18 + -15 = 3
3 = 2c + 6

Reorder the terms:
3 = 6 + 2c

Solving
3 = 6 + 2c

Solving for variable 'c'.

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

Add '-2c' to each side of the equation.
3 + -2c = 6 + 2c + -2c

Combine like terms: 2c + -2c = 0
3 + -2c = 6 + 0
3 + -2c = 6

Add '-3' to each side of the equation.
3 + -3 + -2c = 6 + -3

Combine like terms: 3 + -3 = 0
0 + -2c = 6 + -3
-2c = 6 + -3

Combine like terms: 6 + -3 = 3
-2c = 3

Divide each side by '-2'.
c = -1.5

Simplifying
c = -1.5