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m in (-oo:+oo)
2*(5-(4*m)) = 10 // - 10
2*(5-(4*m))-10 = 0
2*(5-4*m)-10 = 0
2*(5-4*m)-10 = 0
-8*m = 0
-8*m = 0
-8*m = 0 // : -8
m = 0
m = 0
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