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y in (-oo:+oo)
(4/(-13))*y-7 = 6 // - 6
(4/(-13))*y-7-6 = 0
-4/13*y-13 = 0 // + 13
-4/13*y = 13 // : -4/13
y = 13/(-4/13)
y = -169/4
y = -169/4
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