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