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b in (-oo:+oo)
18 = (9*(6-(2*b)))/7 // - (9*(6-(2*b)))/7
18-((9*(6-(2*b)))/7) = 0
(-9/7)*(6-2*b)+18 = 0
18-9/7*(6-2*b) = 0
18-9/7*(6-2*b) = 0
18/7*b+72/7 = 0
18/7*b+72/7 = 0
18/7*b+72/7 = 0 // - 72/7
18/7*b = -72/7 // : 18/7
b = -72/7/18/7
b = -4
b = -4
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