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y in (-oo:+oo)
-1*(3/5)-1.8 = y // - y
-y-1*(3/5)-1.8 = 0
-y-3/5-1.8 = 0
-y-2.4 = 0 // + 2.4
-y = 2.4 // * -1
y = -2.4
y = -2.4
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