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y in (-oo:+oo)
y/3-(2*y)+1 = 15 // - 15
y/3-(2*y)-15+1 = 0
y/3-2*y-15+1 = 0
-5/3*y-14 = 0 // + 14
-5/3*y = 14 // : -5/3
y = 14/(-5/3)
y = -42/5
y = -42/5
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