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b in (-oo:+oo)
(3/5)*b-(7/10) = -6/5 // + -6/5
(3/5)*b-(7/10)-(-6/5) = 0
(3/5)*b-7/10+6/5 = 0
3/5*b+1/2 = 0 // - 1/2
3/5*b = -1/2 // : 3/5
b = -1/2/3/5
b = -5/6
b = -5/6
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