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y in (-oo:+oo)
4/4.2 = (5/0.6)*y // - (5/0.6)*y
4/4.2-((5/0.6)*y) = 0
4/4.2-8.33333333*y = 0
0.95238095-8.33333333*y = 0 // - 0.95238095
-8.33333333*y = -0.95238095 // : -8.33333333
y = -0.95238095/(-8.33333333)
y = 0.11428571
y = 0.11428571
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