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m in (-oo:+oo)
6*(4*m+3) = 42 // - 42
6*(4*m+3)-42 = 0
6*(4*m+3)-42 = 0
24*m-24 = 0
24*m-24 = 0
24*m-24 = 0 // + 24
24*m = 24 // : 24
m = 24/24
m = 1
m = 1
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