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b in (-oo:+oo)
4*b+3/5 = 243/5 // - 243/5
4*b+3/5-(243/5) = 0
4*b+3/5-243/5 = 0
4*b-48 = 0 // + 48
4*b = 48 // : 4
b = 48/4
b = 12
b = 12
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