6+3cos(2x)=9cos(x)

Solution for 6+3cos(2x)=9cos(x) equation:

Simplifying
6 + 3cos(2x) = 9cos(x)

Remove parenthesis around (2x)
6 + 3cos * 2x = 9cos(x)

Reorder the terms for easier multiplication:
6 + 3 * 2cos * x = 9cos(x)

Multiply 3 * 2
6 + 6cos * x = 9cos(x)

Multiply cos * x
6 + 6cosx = 9cos(x)

Multiply cos * x
6 + 6cosx = 9cosx

Solving
6 + 6cosx = 9cosx

Solving for variable 'c'.

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

Add '-9cosx' to each side of the equation.
6 + 6cosx + -9cosx = 9cosx + -9cosx

Combine like terms: 6cosx + -9cosx = -3cosx
6 + -3cosx = 9cosx + -9cosx

Combine like terms: 9cosx + -9cosx = 0
6 + -3cosx = 0

Add '-6' to each side of the equation.
6 + -6 + -3cosx = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -3cosx = 0 + -6
-3cosx = 0 + -6

Combine like terms: 0 + -6 = -6
-3cosx = -6

Divide each side by '-3osx'.
c = 2o-1s-1x-1

Simplifying
c = 2o-1s-1x-1