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x in (-oo:+oo)
(34-((2*x)/7))^2 = 0
((-2/7)*x+34)^2 = 0
(34-2/7*x)^2 = 0
34-2/7*x = 0 // - 34
-2/7*x = -34 // : -2/7
x = -34/(-2/7)
x = 119
x in { 119, 119 }
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