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y in (-oo:+oo)
42/65 = y/120 // - y/120
42/65-(y/120) = 0
42/65-1/120*y = 0 // - 42/65
-1/120*y = -42/65 // : -1/120
y = -42/65/(-1/120)
y = 1008/13
y = 1008/13
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