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b in (-oo:+oo)
9-(b/5) = 5-(b/2) // - 5-(b/2)
b/2-(b/5)-5+9 = 0
3/10*b+4 = 0 // - 4
3/10*b = -4 // : 3/10
b = -4/3/10
b = -40/3
b = -40/3
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