(45-y)/(9-x)=2

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Solution for (45-y)/(9-x)=2 equation: 


D( x )

9-x = 0

9-x = 0

9-x = 0

9-x = 0 // - 9

-x = -9 // * -1

x = 9

x in (-oo:9) U (9:+oo)

(45-y)/(9-x) = 2 // - 2

(45-y)/(9-x)-2 = 0

(45-y)/(9-x)+(-2*(9-x))/(9-x) = 0

45-2*(9-x)-y = 0

2*x-y+27 = 0

(2*x-y+27)/(9-x) = 0

(2*x-y+27)/(9-x) = 0 // * 9-x

2*x-y+27 = 0

2*x-y+27 = 0 // - 27-y

2*x = -(27-y) // : 2

x = (-(27-y))/2

x = (y-27)/2

x = (y-27)/2

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