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b in (-oo:+oo)
7/2+5 = 4*b+3*b+3/3 // - 4*b+3*b+3/3
7/2-(4*b)-(3*b)-(3/3)+5 = 0
7/2-4*b-3*b-1+5 = 0
15/2-7*b = 0 // - 15/2
-7*b = -15/2 // : -7
b = -15/2/(-7)
b = 15/14
b = 15/14
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