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b in (-oo:+oo)
(4/7)*b+6/7 = -6 // + 6
(4/7)*b+6/7+6 = 0
4/7*b+48/7 = 0 // - 48/7
4/7*b = -48/7 // : 4/7
b = -48/7/4/7
b = -12
b = -12
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