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b in (-oo:+oo)
(-1/2)*b+3/5 = -49/10 // + -49/10
(-1/2)*b+3/5-(-49/10) = 0
(-1/2)*b+3/5+49/10 = 0
11/2-1/2*b = 0 // - 11/2
-1/2*b = -11/2 // : -1/2
b = -11/2/(-1/2)
b = 11
b = 11
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