-17.9-4.2=c

Solution for -17.9-4.2=c equation:

Simplifying
-17.9 + -4.2 = c

Combine like terms: -17.9 + -4.2 = -22.1
-22.1 = c

Solving
-22.1 = 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.
-22.1 + -1c = c + -1c

Combine like terms: c + -1c = 0
-22.1 + -1c = 0

Add '22.1' to each side of the equation.
-22.1 + 22.1 + -1c = 0 + 22.1

Combine like terms: -22.1 + 22.1 = 0.0
0.0 + -1c = 0 + 22.1
-1c = 0 + 22.1

Combine like terms: 0 + 22.1 = 22.1
-1c = 22.1

Divide each side by '-1'.
c = -22.1

Simplifying
c = -22.1