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c in (-oo:+oo)
3/4 = 12*c // - 12*c
3/4-(12*c) = 0
3/4-12*c = 0
3/4-12*c = 0 // - 3/4
-12*c = -3/4 // : -12
c = -3/4/(-12)
c = 1/16
c = 1/16
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