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b in (-oo:+oo)
-5 = b/(-2)-7 // - b/(-2)-7
7-(b/(-2))-5 = 0
1/2*b+2 = 0 // - 2
1/2*b = -2 // : 1/2
b = -2/1/2
b = -4
b = -4
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