y=(12-x)/(x-7)

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Solution for y=(12-x)/(x-7) equation: 


D( x )

x-7 = 0

x-7 = 0

x-7 = 0

x-7 = 0 // + 7

x = 7

x in (-oo:7) U (7:+oo)

y = (12-x)/(x-7) // - (12-x)/(x-7)

y-((12-x)/(x-7)) = 0

(-1*(12-x))/(x-7)+y = 0

(-1*(12-x))/(x-7)+(y*(x-7))/(x-7) = 0

y*(x-7)-1*(12-x) = 0

x+x*y-7*y-12 = 0

(x+x*y-7*y-12)/(x-7) = 0

(x+x*y-7*y-12)/(x-7) = 0 // * x-7

x+x*y-7*y-12 = 0

x*y-7*y-12 = 0 // + -7*y-12

x*y = -(-7*y-12) // : y

x = (-(-7*y-12))/y

x = (12-(-7*y))/y

x = (12-(-7*y))/y

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