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b in (-oo:+oo)
17 = 4*b-7*b+8 // - 4*b-7*b+8
17-(-7*b)-(4*b)-8 = 0
7*b-4*b-8+17 = 0
3*b+9 = 0 // - 9
3*b = -9 // : 3
b = -9/3
b = -3
b = -3
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