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y in (-oo:+oo)
y = 7.7447*(-9/4)+9 // - 7.7447*(-9/4)+9
y-(7.7447*(-9/4))-9 = 0
y-9+17.425575 = 0
y+8.425575 = 0 // - 8.425575
y = -8.425575
y = -8.425575
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