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x in (-oo:+oo)
m = (25-x)/(21-48.28) // - (25-x)/(21-48.28)
m-((25-x)/(21-48.28)) = 0
(-1*(25-x))/(-27.28)+m = 0
(-1*(25-x))/(-27.28)+(-27.28*m)/(-27.28) = 0
-1*(25-x)-27.28*m = 0
x-27.28*m-25 = 0
(x-27.28*m-25)/(-27.28) = 0
(x-27.28*m-25)/(-27.28) = 0 // * -27.28
x-27.28*m-25 = 0
x-27.28*m-25 = 0 // + -27.28*m-25
x = -(-27.28*m-25)
x = 25-(-27.28*m)
x = 25-(-27.28*m)
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