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y in (-oo:+oo)
13 = 6*y+7*y+7/4-(5/8) // - 6*y+7*y+7/4-(5/8)
5/8-(6*y)-(7*y)-(7/4)+13 = 0
5/8-6*y-7*y-7/4+13 = 0
95/8-13*y = 0 // - 95/8
-13*y = -95/8 // : -13
y = -95/8/(-13)
y = 95/104
y = 95/104
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