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b in (-oo:+oo)
-10 = b/3-5 // - b/3-5
5-(b/3)-10 = 0
-1/3*b-5 = 0 // + 5
-1/3*b = 5 // : -1/3
b = 5/(-1/3)
b = -15
b = -15
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