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b in (-oo:+oo)
(17/2.6)*b = 30 // - 30
(17/2.6)*b-30 = 0
6.53846154*b-30 = 0 // + 30
6.53846154*b = 30 // : 6.53846154
b = 30/6.53846154
b = 4.58823529
b = 4.58823529
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