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b in (-oo:+oo)
(2*b)/5-(1/10) = -1/2 // + -1/2
(2*b)/5-(1/10)-(-1/2) = 0
(2*b)/5-1/10+1/2 = 0
2/5*b+2/5 = 0 // - 2/5
2/5*b = -2/5 // : 2/5
b = -2/5/2/5
b = -1
b = -1
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