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b in (-oo:+oo)
7*b+3/10 = -53/10 // + -53/10
7*b+3/10-(-53/10) = 0
7*b+3/10+53/10 = 0
7*b+28/5 = 0 // - 28/5
7*b = -28/5 // : 7
b = -28/5/7
b = -4/5
b = -4/5
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