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y in (-oo:+oo)
28 = (7/2)*y // - (7/2)*y
28-((7/2)*y) = 0
(-7/2)*y+28 = 0
28-7/2*y = 0 // - 28
-7/2*y = -28 // : -7/2
y = -28/(-7/2)
y = 8
y = 8
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