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m in (-oo:+oo)
5*(2*m+1) = 55 // - 55
5*(2*m+1)-55 = 0
5*(2*m+1)-55 = 0
10*m-50 = 0
10*m-50 = 0
10*m-50 = 0 // + 50
10*m = 50 // : 10
m = 50/10
m = 5
m = 5
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