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m in (-oo:+oo)
-60 = 10-3*m-(7*m) // - 10-3*m-(7*m)
7*m-(-3*m)-60-10 = 0
3*m+7*m-60-10 = 0
10*m-70 = 0 // + 70
10*m = 70 // : 10
m = 70/10
m = 7
m = 7
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