xy+yf-dx=0

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Solution for xy+yf-dx=0 equation:


Simplifying
xy + yf + -1dx = 0

Reorder the terms:
-1dx + fy + xy = 0

Solving
-1dx + fy + xy = 0

Solving for variable 'd'.

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

Add '-1fy' to each side of the equation.
-1dx + fy + -1fy + xy = 0 + -1fy

Combine like terms: fy + -1fy = 0
-1dx + 0 + xy = 0 + -1fy
-1dx + xy = 0 + -1fy
Remove the zero:
-1dx + xy = -1fy

Add '-1xy' to each side of the equation.
-1dx + xy + -1xy = -1fy + -1xy

Combine like terms: xy + -1xy = 0
-1dx + 0 = -1fy + -1xy
-1dx = -1fy + -1xy

Divide each side by '-1x'.
d = fx-1y + y

Simplifying
d = fx-1y + y

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