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b in (-oo:+oo)
5*b+7/10 = -93/10 // + -93/10
5*b+7/10-(-93/10) = 0
5*b+7/10+93/10 = 0
5*b+10 = 0 // - 10
5*b = -10 // : 5
b = -10/5
b = -2
b = -2
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