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b in (-oo:+oo)
4*b-((5/7)*b)+7 = 7 // - 7
4*b-((5/7)*b)-7+7 = 0
4*b+(-5/7)*b-7+7 = 0
23/7*b = 0 // : 23/7
b = 0
b = 0
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