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m in (-oo:+oo)
2*(5*m+9) = 48 // - 48
2*(5*m+9)-48 = 0
2*(5*m+9)-48 = 0
10*m-30 = 0
10*m-30 = 0
10*m-30 = 0 // + 30
10*m = 30 // : 10
m = 30/10
m = 3
m = 3
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