f(x+y)-y^3-6y=f(x)-5xy

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Solution for f(x+y)-y^3-6y=f(x)-5xy equation:


Simplifying
f(x + y) + -1y3 + -6y = f(x) + -5xy
(x * f + y * f) + -1y3 + -6y = f(x) + -5xy
(fx + fy) + -1y3 + -6y = f(x) + -5xy

Reorder the terms:
fx + fy + -6y + -1y3 = f(x) + -5xy

Multiply f * x
fx + fy + -6y + -1y3 = fx + -5xy

Add '-1fx' to each side of the equation.
fx + fy + -6y + -1fx + -1y3 = fx + -1fx + -5xy

Reorder the terms:
fx + -1fx + fy + -6y + -1y3 = fx + -1fx + -5xy

Combine like terms: fx + -1fx = 0
0 + fy + -6y + -1y3 = fx + -1fx + -5xy
fy + -6y + -1y3 = fx + -1fx + -5xy

Combine like terms: fx + -1fx = 0
fy + -6y + -1y3 = 0 + -5xy
fy + -6y + -1y3 = -5xy

Solving
fy + -6y + -1y3 = -5xy

Solving for variable 'f'.

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

Add '6y' to each side of the equation.
fy + -6y + 6y + -1y3 = -5xy + 6y

Combine like terms: -6y + 6y = 0
fy + 0 + -1y3 = -5xy + 6y
fy + -1y3 = -5xy + 6y

Add 'y3' to each side of the equation.
fy + -1y3 + y3 = -5xy + 6y + y3

Combine like terms: -1y3 + y3 = 0
fy + 0 = -5xy + 6y + y3
fy = -5xy + 6y + y3

Divide each side by 'y'.
f = -5x + 6 + y2

Simplifying
f = -5x + 6 + y2

Reorder the terms:
f = 6 + -5x + y2

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