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y in (-oo:+oo)
4 = y/6.4 // - y/6.4
4-(y/6.4) = 0
4-0.15625*y = 0
4-0.15625*y = 0 // - 4
-0.15625*y = -4 // : -0.15625
y = -4/(-0.15625)
y = 25.6
y = 25.6
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