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b in (-oo:+oo)
(2/15)*b-4 = 3/10 // - 3/10
(2/15)*b-(3/10)-4 = 0
(2/15)*b-3/10-4 = 0
2/15*b-43/10 = 0 // + 43/10
2/15*b = 43/10 // : 2/15
b = 43/10/2/15
b = 129/4
b = 129/4
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