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b in (-oo:+oo)
(12/5)*((10/3)*b+15/4) = 0
12/5*(10/3*b+15/4) = 0
10/3*b+15/4 = 0 // - 15/4
10/3*b = -15/4 // : 10/3
b = -15/4/10/3
b = -9/8
b = -9/8
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