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m in (-oo:+oo)
m-3 = 18-6*m // - 18-6*m
m-(-6*m)-18-3 = 0
m+6*m-18-3 = 0
7*m-21 = 0 // + 21
7*m = 21 // : 7
m = 21/7
m = 3
m = 3
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