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b in (-oo:+oo)
(2/5)*b-7 = -367/55 // + -367/55
(2/5)*b-(-367/55)-7 = 0
(2/5)*b+367/55-7 = 0
2/5*b-18/55 = 0 // + 18/55
2/5*b = 18/55 // : 2/5
b = 18/55/2/5
b = 9/11
b = 9/11
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