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m in (-oo:+oo)
5*m+3 = 2*m+30 // - 2*m+30
5*m-(2*m)-30+3 = 0
5*m-2*m-30+3 = 0
3*m-27 = 0 // + 27
3*m = 27 // : 3
m = 27/3
m = 9
m = 9
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