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y in (-oo:+oo)
9 = y/2.56+7 // - y/2.56+7
9-(y/2.56)-7 = 0
9-0.390625*y-7 = 0
2-0.390625*y = 0 // - 2
-0.390625*y = -2 // : -0.390625
y = -2/(-0.390625)
y = 5.12
y = 5.12
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