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y in (-oo:+oo)
0.8/12 = y/20 // - y/20
0.8/12-(y/20) = 0
0.06666667-1/20*y = 0 // - 0.06666667
-1/20*y = -0.06666667 // : -1/20
y = -0.06666667/(-1/20)
y = 1.3333334
y = 1.3333334
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