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n in (-oo:+oo)
(-7/10)*n = 1/2 // - 1/2
(-7/10)*n-(1/2) = 0
(-7/10)*n-1/2 = 0
-7/10*n-1/2 = 0 // + 1/2
-7/10*n = 1/2 // : -7/10
n = 1/2/(-7/10)
n = -5/7
n = -5/7
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