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b in (-oo:+oo)
5*b-(7/10) = -407/10 // + -407/10
5*b-(7/10)-(-407/10) = 0
5*b-7/10+407/10 = 0
5*b+40 = 0 // - 40
5*b = -40 // : 5
b = -40/5
b = -8
b = -8
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