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y in (-oo:+oo)
0 = (8/15)*y-64 // - (8/15)*y-64
0-((8/15)*y)+64 = 0
(-8/15)*y+0+64 = 0
64-8/15*y = 0 // - 64
-8/15*y = -64 // : -8/15
y = -64/(-8/15)
y = 120
y = 120
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