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b in (-oo:+oo)
18 = (1/2)*(6/5)*b // - (1/2)*(6/5)*b
18-((1/2)*(6/5)*b) = 0
(-3/5)*b+18 = 0
18-3/5*b = 0 // - 18
-3/5*b = -18 // : -3/5
b = -18/(-3/5)
b = 30
b = 30
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