X*2+y*2-6x+8y=-15

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Solution for X*2+y*2-6x+8y=-15 equation: 


Simplifying
X * 2 + y * 2 + -6x + 8y = -15

Reorder the terms for easier multiplication:
2X + y * 2 + -6x + 8y = -15

Reorder the terms for easier multiplication:
2X + 2y + -6x + 8y = -15

Reorder the terms:
2X + -6x + 2y + 8y = -15

Combine like terms: 2y + 8y = 10y
2X + -6x + 10y = -15

Solving
2X + -6x + 10y = -15

Solving for variable 'X'.

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

Add '6x' to each side of the equation.
2X + -6x + 6x + 10y = -15 + 6x

Combine like terms: -6x + 6x = 0
2X + 0 + 10y = -15 + 6x
2X + 10y = -15 + 6x

Add '-10y' to each side of the equation.
2X + 10y + -10y = -15 + 6x + -10y

Combine like terms: 10y + -10y = 0
2X + 0 = -15 + 6x + -10y
2X = -15 + 6x + -10y

Divide each side by '2'.
X = -7.5 + 3x + -5y

Simplifying
X = -7.5 + 3x + -5y

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