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n in (-oo:+oo)
10-7*n = 2*n-98 // - 2*n-98
10-7*n-(2*n)+98 = 0
10-7*n-2*n+98 = 0
108-9*n = 0 // - 108
-9*n = -108 // : -9
n = -108/(-9)
n = 12
n = 12
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