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b in (-oo:+oo)
(1/4)*b+(2/5)*b-5 = -3 // + 3
(1/4)*b+(2/5)*b-5+3 = 0
13/20*b-2 = 0 // + 2
13/20*b = 2 // : 13/20
b = 2/13/20
b = 40/13
b = 40/13
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