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y in (-oo:+oo)
(0.65-(3*y))/4 = 0
(0.65-3*y)/4 = 0
0.65-3*y = 0 // - 0.65
-3*y = -0.65 // : -3
y = -0.65/(-3)
y = 0.21666667
y = 0.21666667
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