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b in (-oo:+oo)
b-((3/5)*b)-5 = -47/10 // + -47/10
b-((3/5)*b)-(-47/10)-5 = 0
(-3/5)*b+b+47/10-5 = 0
2/5*b-3/10 = 0 // + 3/10
2/5*b = 3/10 // : 2/5
b = 3/10/2/5
b = 3/4
b = 3/4
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