x=3cos(1.3x)

Solution for x=3cos(1.3x) equation:

Simplifying
x = 3cos(1.3x)

Remove parenthesis around (1.3x)
x = 3cos * 1.3x

Reorder the terms for easier multiplication:
x = 3 * 1.3cos * x

Multiply 3 * 1.3
x = 3.9cos * x

Multiply cos * x
x = 3.9cosx

Solving
x = 3.9cosx

Solving for variable 'x'.

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

Add '-3.9cosx' to each side of the equation.
-3.9cosx + x = 3.9cosx + -3.9cosx

Combine like terms: 3.9cosx + -3.9cosx = 0.0
-3.9cosx + x = 0.0

Factor out the Greatest Common Factor (GCF), 'x'.
x(-3.9cos + 1) = 0.0

Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0
Subproblem 2
Set the factor '(-3.9cos + 1)' equal to zero and attempt to solve:

Simplifying
-3.9cos + 1 = 0

Reorder the terms:
1 + -3.9cos = 0

Solving
1 + -3.9cos = 0

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

Add '-1' to each side of the equation.
1 + -1 + -3.9cos = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -3.9cos = 0 + -1
-3.9cos = 0 + -1

Combine like terms: 0 + -1 = -1
-3.9cos = -1

Add '3.9cos' to each side of the equation.
-3.9cos + 3.9cos = -1 + 3.9cos

Combine like terms: -3.9cos + 3.9cos = 0.0
0.0 = -1 + 3.9cos

Simplifying
0.0 = -1 + 3.9cos

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Solution
x = {0}