(12/18)x=40/(x-4)

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Solution for (12/18)x=40/(x-4) equation:


D( x )

x-4 = 0

x-4 = 0

x-4 = 0

x-4 = 0 // + 4

x = 4

x in (-oo:4) U (4:+oo)

(12/18)*x = 40/(x-4) // - 40/(x-4)

(12/18)*x-(40/(x-4)) = 0

(12/18)*x-40*(x-4)^-1 = 0

(2*x)/3-40/(x-4) = 0

(-40*3)/(3*(x-4))+(2*x*(x-4))/(3*(x-4)) = 0

2*x*(x-4)-40*3 = 0

2*x^2-8*x-120 = 0

2*x^2-8*x-120 = 0

2*(x^2-4*x-60) = 0

x^2-4*x-60 = 0

DELTA = (-4)^2-(-60*1*4)

DELTA = 256

DELTA > 0

x = (256^(1/2)+4)/(1*2) or x = (4-256^(1/2))/(1*2)

x = 10 or x = -6

2*(x+6)*(x-10) = 0

(2*(x+6)*(x-10))/(3*(x-4)) = 0

(2*(x+6)*(x-10))/(3*(x-4)) = 0 // * 3*(x-4)

2*(x+6)*(x-10) = 0

( x+6 )

x+6 = 0 // - 6

x = -6

( x-10 )

x-10 = 0 // + 10

x = 10

x in { -6, 10 }

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