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b in (-oo:+oo)
7*(6-b) = 28 // - 28
7*(6-b)-28 = 0
7*(6-b)-28 = 0
14-7*b = 0
14-7*b = 0
14-7*b = 0 // - 14
-7*b = -14 // : -7
b = -14/(-7)
b = 2
b = 2
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