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y in (-oo:+oo)
(-9/2)*y+4 = -91/2 // + -91/2
(-9/2)*y-(-91/2)+4 = 0
(-9/2)*y+91/2+4 = 0
99/2-9/2*y = 0 // - 99/2
-9/2*y = -99/2 // : -9/2
y = -99/2/(-9/2)
y = 11
y = 11
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