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n in (-oo:+oo)
-10 = (4/7)*n+12 // - (4/7)*n+12
-((4/7)*n)-12-10 = 0
(-4/7)*n-12-10 = 0
-4/7*n-22 = 0 // + 22
-4/7*n = 22 // : -4/7
n = 22/(-4/7)
n = -77/2
n = -77/2
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