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b in (-oo:+oo)
4*b-((5/6)*b)+4 = 79/15 // - 79/15
4*b-((5/6)*b)-(79/15)+4 = 0
4*b+(-5/6)*b-79/15+4 = 0
19/6*b-19/15 = 0 // + 19/15
19/6*b = 19/15 // : 19/6
b = 19/15/19/6
b = 2/5
b = 2/5
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