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y in (-oo:+oo)
28 = (7/3)*y // - (7/3)*y
28-((7/3)*y) = 0
(-7/3)*y+28 = 0
28-7/3*y = 0 // - 28
-7/3*y = -28 // : -7/3
y = -28/(-7/3)
y = 12
y = 12
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