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n in (-oo:+oo)
(-7/10)*n = 18 // - 18
(-7/10)*n-18 = 0
-7/10*n-18 = 0 // + 18
-7/10*n = 18 // : -7/10
n = 18/(-7/10)
n = -180/7
n = -180/7
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