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n in (-oo:+oo)
4*n-(7*n)+10 = 28 // - 28
4*n-(7*n)-28+10 = 0
4*n-7*n-28+10 = 0
-3*n-18 = 0 // + 18
-3*n = 18 // : -3
n = 18/(-3)
n = -6
n = -6
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