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y in (-oo:+oo)
15 = (5*y)/4 // - (5*y)/4
15-((5*y)/4) = 0
(-5/4)*y+15 = 0
15-5/4*y = 0 // - 15
-5/4*y = -15 // : -5/4
y = -15/(-5/4)
y = 12
y = 12
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