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b in (-oo:+oo)
-((2/3)*b) = -30 // + 30
30-((2/3)*b) = 0
(-2/3)*b+30 = 0
30-2/3*b = 0 // - 30
-2/3*b = -30 // : -2/3
b = -30/(-2/3)
b = 45
b = 45
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