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b in (-oo:+oo)
(3/4)*b-((1/5)*b) = 11 // - 11
(3/4)*b-((1/5)*b)-11 = 0
(3/4)*b+(-1/5)*b-11 = 0
11/20*b-11 = 0 // + 11
11/20*b = 11 // : 11/20
b = 11/11/20
b = 20
b = 20
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