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b in (-oo:+oo)
(2*b)/7-((3-(3*b))/2)+1 = 0
(2*b)/7-((3-3*b)/2)+1 = 0
(-1*(3-3*b))/2+(2*b)/7+1 = 0
(-1*7*(3-3*b))/(2*7)+(2*2*b)/(2*7)+(1*2*7)/(2*7) = 0
2*2*b-1*7*(3-3*b)+1*2*7 = 0
25*b-21+14 = 0
25*b-7 = 0
(25*b-7)/(2*7) = 0
(25*b-7)/(2*7) = 0 // * 2*7
25*b-7 = 0
25*b-7 = 0 // + 7
25*b = 7 // : 25
b = 7/25
b = 7/25
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