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b in (-oo:+oo)
b/2-7 = b/3-1 // - b/3-1
b/2-(b/3)-7+1 = 0
1/6*b-6 = 0 // + 6
1/6*b = 6 // : 1/6
b = 6/1/6
b = 36
b = 36
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