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b in (-oo:+oo)
4/12 = b/36 // - b/36
4/12-(b/36) = 0
1/3-1/36*b = 0 // - 1/3
-1/36*b = -1/3 // : -1/36
b = -1/3/(-1/36)
b = 12
b = 12
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