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y in (-oo:+oo)
y/2 = 15/6 // - 15/6
y/2-(15/6) = 0
y/2-5/2 = 0
1/2*y-5/2 = 0 // + 5/2
1/2*y = 5/2 // : 1/2
y = 5/2/1/2
y = 5
y = 5
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