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y in (-oo:+oo)
2.8/2 = (2*y)/2 // - (2*y)/2
2.8/2-((2*y)/2) = 0
2.8/2-y = 0
1.4-y = 0 // - 1.4
-y = -1.4 // * -1
y = 1.4
y = 1.4
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