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b in (-oo:+oo)
1/3-((3/5)*b) = (2/3)*b+1/60 // - (2/3)*b+1/60
1/3-((3/5)*b)-((2/3)*b)-(1/60) = 0
(-3/5)*b+(-2/3)*b+1/3-1/60 = 0
19/60-19/15*b = 0 // - 19/60
-19/15*b = -19/60 // : -19/15
b = -19/60/(-19/15)
b = 1/4
b = 1/4
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