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n in (-oo:+oo)
(5/6)*n-((1/3)*n) = -15 // + 15
(5/6)*n-((1/3)*n)+15 = 0
(5/6)*n+(-1/3)*n+15 = 0
1/2*n+15 = 0 // - 15
1/2*n = -15 // : 1/2
n = -15/1/2
n = -30
n = -30
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