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b in (-oo:+oo)
3-((2/6)*b) = 1/3-7 // - 1/3-7
3-((2/6)*b)-(1/3)+7 = 0
(-1/3)*b-1/3+3+7 = 0
29/3-1/3*b = 0 // - 29/3
-1/3*b = -29/3 // : -1/3
b = -29/3/(-1/3)
b = 29
b = 29
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