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