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b in (-oo:+oo)
3/4-(b/2) = -3/7 // + -3/7
3/4-(b/2)-(-3/7) = 0
3/4-(b/2)+3/7 = 0
33/28-1/2*b = 0 // - 33/28
-1/2*b = -33/28 // : -1/2
b = -33/28/(-1/2)
b = 33/14
b = 33/14
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