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b in (-oo:+oo)
(-1/7)*b-4 = 3 // - 3
(-1/7)*b-4-3 = 0
-1/7*b-7 = 0 // + 7
-1/7*b = 7 // : -1/7
b = 7/(-1/7)
b = -49
b = -49
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