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y in (-oo:+oo)
8*y-(8*(13/8)) = 30 // - 30
8*y-(8*(13/8))-30 = 0
8*y-30-13 = 0
8*y-43 = 0 // + 43
8*y = 43 // : 8
y = 43/8
y = 43/8
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