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m in (-oo:+oo)
4*(2*m+3) = 60 // - 60
4*(2*m+3)-60 = 0
4*(2*m+3)-60 = 0
8*m-48 = 0
8*m-48 = 0
8*m-48 = 0 // + 48
8*m = 48 // : 8
m = 48/8
m = 6
m = 6
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