c-c-90=o

Solution for c-c-90=o equation:

Simplifying
c + -1c + -90 = o

Reorder the terms:
-90 + c + -1c = o

Combine like terms: c + -1c = 0
-90 + 0 = o
-90 = o

Solving
-90 = o

Solving for variable 'o'.

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

Add '-1o' to each side of the equation.
-90 + -1o = o + -1o

Combine like terms: o + -1o = 0
-90 + -1o = 0

Add '90' to each side of the equation.
-90 + 90 + -1o = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -1o = 0 + 90
-1o = 0 + 90

Combine like terms: 0 + 90 = 90
-1o = 90

Divide each side by '-1'.
o = -90

Simplifying
o = -90