(x-40)/(87-x)=0.5

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Solution for (x-40)/(87-x)=0.5 equation: 


D( x )

87-x = 0

87-x = 0

87-x = 0

87-x = 0 // - 87

-x = -87 // * -1

x = 87

x in (-oo:87) U (87:+oo)

(x-40)/(87-x) = 0.5 // - 0.5

(x-40)/(87-x)-0.5 = 0

(x-40)/(87-x)+(-0.5*(87-x))/(87-x) = 0

x-0.5*(87-x)-40 = 0

1.5*x-83.5 = 0

(1.5*x-83.5)/(87-x) = 0

(1.5*x-83.5)/(87-x) = 0 // * 87-x

1.5*x-83.5 = 0

1.5*x-83.5 = 0 // + 83.5

1.5*x = 83.5 // : 1.5

x = 83.5/1.5

x = 55.66666667

x = 55.66666667

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