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m in (-oo:+oo)
3*(5*m+1) = 48 // - 48
3*(5*m+1)-48 = 0
3*(5*m+1)-48 = 0
15*m-45 = 0
15*m-45 = 0
15*m-45 = 0 // + 45
15*m = 45 // : 15
m = 45/15
m = 3
m = 3
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