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b in (-oo:+oo)
(3*(b+2))/2 = 4*b-(10/4) // - 4*b-(10/4)
(3*(b+2))/2-(4*b)+10/4 = 0
(3*(b+2))/2-4*b+10/4 = 0
(3*(b+2))/2-4*b+5/2 = 0
(3*(b+2))/2+(-4*2*b)/2+5/2 = 0
3*(b+2)-4*2*b+5 = 0
5-5*b+6 = 0
11-5*b = 0
(11-5*b)/2 = 0
(11-5*b)/2 = 0 // * 2
11-5*b = 0
11-5*b = 0 // - 11
-5*b = -11 // : -5
b = -11/(-5)
b = 11/5
b = 11/5
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