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y in (-oo:+oo)
2*y-(1/2) = 10 // - 10
2*y-(1/2)-10 = 0
2*y-1/2-10 = 0
2*y-21/2 = 0 // + 21/2
2*y = 21/2 // : 2
y = 21/2/2
y = 21/4
y = 21/4
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