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y in (-oo:+oo)
20-((3*y)/5) = y-12 // - y-12
12-((3*y)/5)-y+20 = 0
(-3/5)*y-y+12+20 = 0
32-8/5*y = 0 // - 32
-8/5*y = -32 // : -8/5
y = -32/(-8/5)
y = 20
y = 20
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