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b in (-oo:+oo)
2*(4-(5*b)) = -102 // + 102
2*(4-(5*b))+102 = 0
2*(4-5*b)+102 = 0
2*(4-5*b)+102 = 0
110-10*b = 0
110-10*b = 0
110-10*b = 0 // - 110
-10*b = -110 // : -10
b = -110/(-10)
b = 11
b = 11
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