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y in (-oo:+oo)
(1/4)*y+1/2 = 5 // - 5
(1/4)*y+1/2-5 = 0
1/4*y-9/2 = 0 // + 9/2
1/4*y = 9/2 // : 1/4
y = 9/2/1/4
y = 18
y = 18
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