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b in (-oo:+oo)
(-2/3)*b+2/5 = 6.4/5 // - 6.4/5
(-2/3)*b+2/5-(6.4/5) = 0
(-2/3)*b+2/5-1.28 = 0
-2/3*b-0.88 = 0 // + 0.88
-2/3*b = 0.88 // : -2/3
b = 0.88/(-2/3)
b = -1.31999999
b = -1.31999999
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