121=(1/2)*x*2x

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Solution for 121=(1/2)*x*2x equation: 


x in (-oo:+oo)

121 = 2*(1/2)*x*x // - 2*(1/2)*x*x

121-(2*(1/2)*x*x) = 0

121-x^2 = 0

-1*x^2 = -121 // : -1

x^2 = 121

x^2 = 121 // ^ 1/2

abs(x) = 11

x = 11 or x = -11

x in { 11, -11 }

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