1/2-12/(x+3)=4

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Solution for 1/2-12/(x+3)=4 equation: 


D( x )

x+3 = 0

x+3 = 0

x+3 = 0

x+3 = 0 // - 3

x = -3

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

1/2-(12/(x+3)) = 4 // - 4

1/2-(12/(x+3))-4 = 0

1/2-12*(x+3)^-1-4 = 0

1/2-12/(x+3)-4 = 0

(-12*2)/(2*(x+3))+(1*(x+3))/(2*(x+3))+(-4*2*(x+3))/(2*(x+3)) = 0

1*(x+3)-4*2*(x+3)-12*2 = 0

x-8*x-24-21 = 0

-7*x-45 = 0

(-7*x-45)/(2*(x+3)) = 0

(-7*x-45)/(2*(x+3)) = 0 // * 2*(x+3)

-7*x-45 = 0

-7*x-45 = 0 // + 45

-7*x = 45 // : -7

x = 45/(-7)

x = -45/7

x = -45/7

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