(40+x)/(80+x)=0.60

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Solution for (40+x)/(80+x)=0.60 equation: 


D( x )

x+80 = 0

x+80 = 0

x+80 = 0

x+80 = 0 // - 80

x = -80

x in (-oo:-80) U (-80:+oo)

(x+40)/(x+80) = 0.6 // - 0.6

(x+40)/(x+80)-0.6 = 0

(x+40)/(x+80)+(-0.6*(x+80))/(x+80) = 0

x-0.6*(x+80)+40 = 0

0.4*x-8 = 0

(0.4*x-8)/(x+80) = 0

(0.4*x-8)/(x+80) = 0 // * x+80

0.4*x-8 = 0

0.4*x-8 = 0 // + 8

0.4*x = 8 // : 0.4

x = 8/0.4

x = 20

x = 20

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