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m in (-oo:+oo)
7*m-(5*m)-2 = 18 // - 18
7*m-(5*m)-18-2 = 0
7*m-5*m-18-2 = 0
2*m-20 = 0 // + 20
2*m = 20 // : 2
m = 20/2
m = 10
m = 10
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