XY-1=0

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Solution for XY-1=0 equation: 


Simplifying
XY + -1 = 0

Reorder the terms:
-1 + XY = 0

Solving
-1 + XY = 0

Solving for variable 'X'.

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

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

Combine like terms: -1 + 1 = 0
0 + XY = 0 + 1
XY = 0 + 1

Combine like terms: 0 + 1 = 1
XY = 1

Divide each side by 'Y'.
X = Y-1

Simplifying
X = Y-1

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