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b in (-oo:+oo)
7*(b-5) = -112 // + 112
7*(b-5)+112 = 0
7*(b-5)+112 = 0
7*b+77 = 0
7*b+77 = 0
7*b+77 = 0 // - 77
7*b = -77 // : 7
b = -77/7
b = -11
b = -11
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