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b in (-oo:+oo)
-4*b-8 = 6*b-98 // - 6*b-98
98-4*b-(6*b)-8 = 0
98-4*b-6*b-8 = 0
90-10*b = 0 // - 90
-10*b = -90 // : -10
b = -90/(-10)
b = 9
b = 9
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