-7cos(3x)-5=0

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Solution for -7cos(3x)-5=0 equation:


Simplifying
-7cos(3x) + -5 = 0

Remove parenthesis around (3x)
-7cos * 3x + -5 = 0

Reorder the terms for easier multiplication:
-7 * 3cos * x + -5 = 0

Multiply -7 * 3
-21cos * x + -5 = 0

Multiply cos * x
-21cosx + -5 = 0

Reorder the terms:
-5 + -21cosx = 0

Solving
-5 + -21cosx = 0

Solving for variable 'c'.

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

Add '5' to each side of the equation.
-5 + 5 + -21cosx = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -21cosx = 0 + 5
-21cosx = 0 + 5

Combine like terms: 0 + 5 = 5
-21cosx = 5

Divide each side by '-21osx'.
c = -0.2380952381o-1s-1x-1

Simplifying
c = -0.2380952381o-1s-1x-1

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