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y in (-oo:+oo)
y/4-3 = y/3 // - y/3
y/4-(y/3)-3 = 0
-1/12*y-3 = 0 // + 3
-1/12*y = 3 // : -1/12
y = 3/(-1/12)
y = -36
y = -36
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