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y in (-oo:+oo)
(-1/3)*y-6 = -11 // + 11
(-1/3)*y-6+11 = 0
5-1/3*y = 0 // - 5
-1/3*y = -5 // : -1/3
y = -5/(-1/3)
y = 15
y = 15
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