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n in (-oo:+oo)
7-4*n = 3*n+70 // - 3*n+70
7-4*n-(3*n)-70 = 0
7-4*n-3*n-70 = 0
-7*n-63 = 0 // + 63
-7*n = 63 // : -7
n = 63/(-7)
n = -9
n = -9
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