(7-7x^2)/7

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Solution for (7-7x^2)/7 equation: 


x in (-oo:+oo)

(7-(7*x^2))/7 = 0

(7-7*x^2)/7 = 0

-7*x^2 = -7 // : -7

x^2 = 1

x^2 = 1 // ^ 1/2

abs(x) = 1

x = 1 or x = -1

x in { 1, -1 }

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