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n in (-oo:+oo)
(2/3)*n-4/5 = -34/5 // + -34/5
(2/3)*n-4/5-(-34/5) = 0
(2/3)*n-4/5+34/5 = 0
2/3*n+6 = 0 // - 6
2/3*n = -6 // : 2/3
n = -6/2/3
n = -9
n = -9
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