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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-1294/5 = 0 // + 1294/5
-2/3*b = 1294/5 // : -2/3
b = 1294/5/(-2/3)
b = -1941/5
b = -1941/5
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