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b in (-oo:+oo)
4*b-((5*b)/4) = 2 // - 2
4*b-((5*b)/4)-2 = 0
4*b+(-5/4)*b-2 = 0
11/4*b-2 = 0 // + 2
11/4*b = 2 // : 11/4
b = 2/11/4
b = 8/11
b = 8/11
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