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b in (-oo:+oo)
(-3/4)*b = -6/7 // + -6/7
(-3/4)*b-(-6/7) = 0
(-3/4)*b+6/7 = 0
6/7-3/4*b = 0 // - 6/7
-3/4*b = -6/7 // : -3/4
b = -6/7/(-3/4)
b = 8/7
b = 8/7
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