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b in (-oo:+oo)
(1/4)*b+(2/3)*b+2/7 = 2/7 // - 2/7
(1/4)*b+(2/3)*b+2/7-(2/7) = 0
(1/4)*b+(2/3)*b+2/7-2/7 = 0
11/12*b = 0 // : 11/12
b = 0
b = 0
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