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y in (-oo:+oo)
2/5+7/8 = y/20 // - y/20
2/5-(y/20)+7/8 = 0
51/40-1/20*y = 0 // - 51/40
-1/20*y = -51/40 // : -1/20
y = -51/40/(-1/20)
y = 51/2
y = 51/2
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