9/49x^2-81=0

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Solution for 9/49x^2-81=0 equation: 


x in (-oo:+oo)

(9/49)*x^2-81 = 0

9/49*x^2 = 81 // : 9/49

x^2 = 441

x^2 = 441 // ^ 1/2

abs(x) = 21

x = 21 or x = -21

x in { 21, -21 }

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