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b in (-oo:+oo)
(-2/3)*b+2/5 = 64-5 // - 64-5
(-2/3)*b+2/5-64+5 = 0
-2/3*b-293/5 = 0 // + 293/5
-2/3*b = 293/5 // : -2/3
b = 293/5/(-2/3)
b = -879/10
b = -879/10
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