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n in (-oo:+oo)
(-2/3)*n+4 = 10/3 // - 10/3
(-2/3)*n-(10/3)+4 = 0
(-2/3)*n-10/3+4 = 0
2/3-2/3*n = 0 // - 2/3
-2/3*n = -2/3 // : -2/3
n = -2/3/(-2/3)
n = 1
n = 1
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