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m in (-oo:+oo)
2*(5*m-2) = 116 // - 116
2*(5*m-2)-116 = 0
2*(5*m-2)-116 = 0
10*m-120 = 0
10*m-120 = 0
10*m-120 = 0 // + 120
10*m = 120 // : 10
m = 120/10
m = 12
m = 12
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