(39+x)/(12+x)=2

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Solution for (39+x)/(12+x)=2 equation: 


D( x )

x+12 = 0

x+12 = 0

x+12 = 0

x+12 = 0 // - 12

x = -12

x in (-oo:-12) U (-12:+oo)

(x+39)/(x+12) = 2 // - 2

(x+39)/(x+12)-2 = 0

(x+39)/(x+12)+(-2*(x+12))/(x+12) = 0

x-2*(x+12)+39 = 0

15-x = 0

(15-x)/(x+12) = 0

(15-x)/(x+12) = 0 // * x+12

15-x = 0

15-x = 0 // - 15

-x = -15 // * -1

x = 15

x = 15

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