144/21-d^2/21

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Solution for 144/21-d^2/21 equation: 


d in (-oo:+oo)

144/21-((d^2)/21) = 0

-1/21*d^2 = -48/7 // : -1/21

d^2 = 144

d^2 = 144 // ^ 1/2

abs(d) = 12

d = 12 or d = -12

d in { 12, -12 }

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