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b in (-oo:+oo)
79 = 3*b+4*b+2 // - 3*b+4*b+2
79-(3*b)-(4*b)-2 = 0
79-3*b-4*b-2 = 0
77-7*b = 0 // - 77
-7*b = -77 // : -7
b = -77/(-7)
b = 11
b = 11
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