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b in (-oo:+oo)
(1/2)*b-(4/5) = 7/10 // - 7/10
(1/2)*b-(4/5)-(7/10) = 0
(1/2)*b-4/5-7/10 = 0
1/2*b-3/2 = 0 // + 3/2
1/2*b = 3/2 // : 1/2
b = 3/2/1/2
b = 3
b = 3
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