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y in (-oo:+oo)
-6 = y/4-3 // - y/4-3
3-(y/4)-6 = 0
-1/4*y-3 = 0 // + 3
-1/4*y = 3 // : -1/4
y = 3/(-1/4)
y = -12
y = -12
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