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n in (-oo:+oo)
(-2/5)*n+7/9 = 17/18 // - 17/18
(-2/5)*n+7/9-(17/18) = 0
(-2/5)*n+7/9-17/18 = 0
-2/5*n-1/6 = 0 // + 1/6
-2/5*n = 1/6 // : -2/5
n = 1/6/(-2/5)
n = -5/12
n = -5/12
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