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y in (-oo:+oo)
(1/5)*y-3 = 1/2 // - 1/2
(1/5)*y-(1/2)-3 = 0
(1/5)*y-1/2-3 = 0
1/5*y-7/2 = 0 // + 7/2
1/5*y = 7/2 // : 1/5
y = 7/2/1/5
y = 35/2
y = 35/2
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