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m in (-oo:+oo)
4*m-((4/6)*m)-20 = 0
4*m+(-2/3)*m-20 = 0
10/3*m-20 = 0 // + 20
10/3*m = 20 // : 10/3
m = 20/10/3
m = 6
m = 6
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