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y in (-oo:+oo)
8*y-(8*((13*y)/8)) = 30 // - 30
8*y-(8*((13*y)/8))-30 = 0
8*y-13*y-30 = 0
-5*y-30 = 0 // + 30
-5*y = 30 // : -5
y = 30/(-5)
y = -6
y = -6
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