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y in (-oo:+oo)
(8-((2*y)/7.14))^2 = 0
(8-0.28011204*y)^2 = 0
8-0.28011204*y = 0 // - 8
-0.28011204*y = -8 // : -0.28011204
y = -8/(-0.28011204)
y = 28.56000049
y in { 28.56000049, 28.56000049 }
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