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b in (-oo:+oo)
(-1/7)*b+1/10 = -53/70 // + -53/70
(-1/7)*b+1/10-(-53/70) = 0
(-1/7)*b+1/10+53/70 = 0
6/7-1/7*b = 0 // - 6/7
-1/7*b = -6/7 // : -1/7
b = -6/7/(-1/7)
b = 6
b = 6
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