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y in (-oo:+oo)
8-3 = (1/2)*y-5 // - (1/2)*y-5
5-((1/2)*y)-3+8 = 0
(-1/2)*y-3+5+8 = 0
10-1/2*y = 0 // - 10
-1/2*y = -10 // : -1/2
y = -10/(-1/2)
y = 20
y = 20
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