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y in (-oo:+oo)
3-((15*y)/2)-(2*y) = 30 // - 30
3-((15*y)/2)-(2*y)-30 = 0
(-15/2)*y-2*y-30+3 = 0
-19/2*y-27 = 0 // + 27
-19/2*y = 27 // : -19/2
y = 27/(-19/2)
y = -54/19
y = -54/19
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