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y in (-oo:+oo)
(7.44-(1.28*(87.44-y)))/1.28 = 0
(7.44-1.28*(87.44-y))/1.28 = 0
7.44-1.28*(87.44-y) = 0
7.44-1.28*(87.44-y) = 0
1.28*y-104.4832 = 0
1.28*y-104.4832 = 0
(1.28*y-104.4832)/1.28 = 0
1.28*y-104.4832 = 0 // + 104.4832
1.28*y = 104.4832 // : 1.28
y = 104.4832/1.28
y = 81.6275
y = 81.6275
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