(x/4)(2x/5)=40

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Solution for (x/4)(2x/5)=40 equation: 


x in (-oo:+oo)

(x/4)*((2*x)/5) = 40 // - 40

(x/4)*((2*x)/5)-40 = 0

1/10*x^2 = 40 // : 1/10

x^2 = 400

x^2 = 400 // ^ 1/2

abs(x) = 20

x = 20 or x = -20

x in { 20, -20 }

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