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b in (-oo:+oo)
(-4/5)*b+2/5 = -46/5 // + -46/5
(-4/5)*b+2/5-(-46/5) = 0
(-4/5)*b+2/5+46/5 = 0
48/5-4/5*b = 0 // - 48/5
-4/5*b = -48/5 // : -4/5
b = -48/5/(-4/5)
b = 12
b = 12
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