(12+9)/(6x+4)+5=12

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Solution for (12+9)/(6x+4)+5=12 equation: 


D( x )

6*x+4 = 0

6*x+4 = 0

6*x+4 = 0

6*x+4 = 0 // - 4

6*x = -4 // : 6

x = -4/6

x = -2/3

x in (-oo:-2/3) U (-2/3:+oo)

(9+12)/(6*x+4)+5 = 12 // - 12

(9+12)/(6*x+4)-12+5 = 0

21/(6*x+4)-12+5 = 0

21/(6*x+4)+(-12*(6*x+4))/(6*x+4)+(5*(6*x+4))/(6*x+4) = 0

5*(6*x+4)-12*(6*x+4)+21 = 0

30*x-72*x-27+20 = 0

-42*x-7 = 0

(-42*x-7)/(6*x+4) = 0

(-42*x-7)/(6*x+4) = 0 // * 6*x+4

-42*x-7 = 0

-42*x-7 = 0 // + 7

-42*x = 7 // : -42

x = 7/(-42)

x = -1/6

x = -1/6

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