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b in (-oo:+oo)
(-7/20)*b+2 = 8/5 // - 8/5
(-7/20)*b-(8/5)+2 = 0
(-7/20)*b-8/5+2 = 0
2/5-7/20*b = 0 // - 2/5
-7/20*b = -2/5 // : -7/20
b = -2/5/(-7/20)
b = 8/7
b = 8/7
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