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