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x in (-oo:+oo)
((3*x)/3)*x-7 = 0
1*x^2 = 7 // : 1
x^2 = 7
x^2 = 7 // ^ 1/2
abs(x) = 7^(1/2)
x = 7^(1/2) or x = -7^(1/2)
x in { 7^(1/2), -7^(1/2) }
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