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b in (-oo:+oo)
4/7-((4/7)*b) = (3/7)*b+46/7 // - (3/7)*b+46/7
4/7-((4/7)*b)-((3/7)*b)-(46/7) = 0
(-4/7)*b+(-3/7)*b+4/7-46/7 = 0
-b-6 = 0 // + 6
-b = 6 // * -1
b = -6
b = -6
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