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y in (-oo:+oo)
28 = (4*y)/9 // - (4*y)/9
28-((4*y)/9) = 0
(-4/9)*y+28 = 0
28-4/9*y = 0 // - 28
-4/9*y = -28 // : -4/9
y = -28/(-4/9)
y = 63
y = 63
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