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y in (-oo:+oo)
7*y-(5/2) = 8 // - 8
7*y-(5/2)-8 = 0
7*y-5/2-8 = 0
7*y-21/2 = 0 // + 21/2
7*y = 21/2 // : 7
y = 21/2/7
y = 3/2
y = 3/2
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