(x^2-6xy-7y^2)-(x^2+xy)=0

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Solution for (x^2-6xy-7y^2)-(x^2+xy)=0 equation:


Simplifying
(x2 + -6xy + -7y2) + -1(x2 + xy) = 0

Reorder the terms:
(-6xy + x2 + -7y2) + -1(x2 + xy) = 0

Remove parenthesis around (-6xy + x2 + -7y2)
-6xy + x2 + -7y2 + -1(x2 + xy) = 0

Reorder the terms:
-6xy + x2 + -7y2 + -1(xy + x2) = 0
-6xy + x2 + -7y2 + (xy * -1 + x2 * -1) = 0
-6xy + x2 + -7y2 + (-1xy + -1x2) = 0

Reorder the terms:
-6xy + -1xy + x2 + -1x2 + -7y2 = 0

Combine like terms: -6xy + -1xy = -7xy
-7xy + x2 + -1x2 + -7y2 = 0

Combine like terms: x2 + -1x2 = 0
-7xy + 0 + -7y2 = 0
-7xy + -7y2 = 0

Solving
-7xy + -7y2 = 0

Solving for variable 'x'.

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

Add '7y2' to each side of the equation.
-7xy + -7y2 + 7y2 = 0 + 7y2

Combine like terms: -7y2 + 7y2 = 0
-7xy + 0 = 0 + 7y2
-7xy = 0 + 7y2
Remove the zero:
-7xy = 7y2

Divide each side by '-7y'.
x = -1y

Simplifying
x = -1y

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