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b in (-oo:+oo)
19*b-(19/7) = 2*b-3 // - 2*b-3
19*b-(2*b)-(19/7)+3 = 0
19*b-2*b-19/7+3 = 0
17*b+2/7 = 0 // - 2/7
17*b = -2/7 // : 17
b = -2/7/17
b = -2/119
b = -2/119
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