100=(40-X)/4*X

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Solution for 100=(40-X)/4*X equation: 


X in (-oo:+oo)

100 = X*((40-X)/4) // - X*((40-X)/4)

100-(X*((40-X)/4)) = 0

(-1*X*(40-X))/4+100 = 0

(-1*X*(40-X))/4+(4*100)/4 = 0

4*100-1*X*(40-X) = 0

X^2-40*X+400 = 0

X^2-40*X+400 = 0

X^2-40*X+400 = 0

DELTA = (-40)^2-(1*4*400)

DELTA = 0

X = 40/(1*2)

X = 20 or X = 20

(X-20)^2 = 0

((X-20)^2)/4 = 0

((X-20)^2)/4 = 0 // * 4

(X-20)^2 = 0

X-20 = 0 // + 20

X = 20

X in { 20, 20 }

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