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y in (-oo:+oo)
3-(4*y) = -1/2 // + -1/2
3-(4*y)-(-1/2) = 0
1/2-4*y+3 = 0
7/2-4*y = 0 // - 7/2
-4*y = -7/2 // : -4
y = -7/2/(-4)
y = 7/8
y = 7/8
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