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b in (-oo:+oo)
88 = 5*b+5*b-2 // - 5*b+5*b-2
2-(5*b)-(5*b)+88 = 0
2-5*b-5*b+88 = 0
90-10*b = 0 // - 90
-10*b = -90 // : -10
b = -90/(-10)
b = 9
b = 9
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