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y in (-oo:+oo)
8/15 = (6/7)*y // - (6/7)*y
8/15-((6/7)*y) = 0
(-6/7)*y+8/15 = 0
8/15-6/7*y = 0 // - 8/15
-6/7*y = -8/15 // : -6/7
y = -8/15/(-6/7)
y = 28/45
y = 28/45
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