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b in (-oo:+oo)
-237 = b/21-225 // - b/21-225
225-(b/21)-237 = 0
-1/21*b-12 = 0 // + 12
-1/21*b = 12 // : -1/21
b = 12/(-1/21)
b = -252
b = -252
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