f(x+y)+f(x-y)=f(7x)

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Solution for f(x+y)+f(x-y)=f(7x) equation:


Simplifying
f(x + y) + f(x + -1y) = f(7x)
(x * f + y * f) + f(x + -1y) = f(7x)
(fx + fy) + f(x + -1y) = f(7x)
fx + fy + (x * f + -1y * f) = f(7x)
fx + fy + (fx + -1fy) = f(7x)

Reorder the terms:
fx + fx + fy + -1fy = f(7x)

Combine like terms: fx + fx = 2fx
2fx + fy + -1fy = f(7x)

Combine like terms: fy + -1fy = 0
2fx + 0 = f(7x)
2fx = f(7x)

Remove parenthesis around (7x)
2fx = f * 7x

Reorder the terms for easier multiplication:
2fx = 7f * x

Multiply f * x
2fx = 7fx

Solving
2fx = 7fx

Solving for variable 'f'.

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

Add '-7fx' to each side of the equation.
2fx + -7fx = 7fx + -7fx

Combine like terms: 2fx + -7fx = -5fx
-5fx = 7fx + -7fx

Combine like terms: 7fx + -7fx = 0
-5fx = 0

Divide each side by '-5'.
fx = 0

Simplifying
fx = 0

The solution to this equation could not be determined.

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