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y in (-oo:+oo)
(0.8*y)/2.2 = 6.4 // - 6.4
(0.8*y)/2.2-6.4 = 0
0.36363636*y-6.4 = 0 // + 6.4
0.36363636*y = 6.4 // : 0.36363636
y = 6.4/0.36363636
y = 17.60000018
y = 17.60000018
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