(x*4x)/2=72

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Solution for (x*4x)/2=72 equation: 


x in (-oo:+oo)

(4*x*x)/2 = 72 // - 72

(4*x*x)/2-72 = 0

2*x^2 = 72 // : 2

x^2 = 36

x^2 = 36 // ^ 1/2

abs(x) = 6

x = 6 or x = -6

x in { 6, -6 }

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