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b in (-oo:+oo)
3/10-7*b = -61/30 // + -61/30
3/10-7*b-(-61/30) = 0
3/10-7*b+61/30 = 0
7/3-7*b = 0 // - 7/3
-7*b = -7/3 // : -7
b = -7/3/(-7)
b = 1/3
b = 1/3
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