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y in (-oo:+oo)
12.8 = y/8 // - y/8
12.8-(y/8) = 0
12.8-1/8*y = 0 // - 12.8
-1/8*y = -12.8 // : -1/8
y = -12.8/(-1/8)
y = 102.4
y = 102.4
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