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b in (-oo:+oo)
(2*b)/5+1/10 = (3*b)/2 // - (3*b)/2
(2*b)/5-((3*b)/2)+1/10 = 0
(2*b)/5+(-3/2)*b+1/10 = 0
1/10-11/10*b = 0 // - 1/10
-11/10*b = -1/10 // : -11/10
b = -1/10/(-11/10)
b = 1/11
b = 1/11
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