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b in (-oo:+oo)
b-(3*b)+3/7 = -95/7 // + -95/7
b-(3*b)+3/7-(-95/7) = 0
b-3*b+3/7+95/7 = 0
14-2*b = 0 // - 14
-2*b = -14 // : -2
b = -14/(-2)
b = 7
b = 7
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