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x in (-oo:+oo)
((1*x^1)/7)*x = 7 // - 7
((1*x^1)/7)*x-7 = 0
(x/7)*x-7 = 0
1/7*x^2 = 7 // : 1/7
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
x in { 7, -7 }
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