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y in (-oo:+oo)
56 = (4/7)*y // - (4/7)*y
56-((4/7)*y) = 0
(-4/7)*y+56 = 0
56-4/7*y = 0 // - 56
-4/7*y = -56 // : -4/7
y = -56/(-4/7)
y = 98
y = 98
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