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y in (-oo:+oo)
28 = (4/7)*y // - (4/7)*y
28-((4/7)*y) = 0
(-4/7)*y+28 = 0
28-4/7*y = 0 // - 28
-4/7*y = -28 // : -4/7
y = -28/(-4/7)
y = 49
y = 49
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