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m in (-oo:+oo)
10-4*m = 6*m+30 // - 6*m+30
10-4*m-(6*m)-30 = 0
10-4*m-6*m-30 = 0
-10*m-20 = 0 // + 20
-10*m = 20 // : -10
m = 20/(-10)
m = -2
m = -2
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