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n in (-oo:+oo)
(4/9)*n-((1/3)*n)-8 = 7 // - 7
(4/9)*n-((1/3)*n)-8-7 = 0
(4/9)*n+(-1/3)*n-8-7 = 0
1/9*n-15 = 0 // + 15
1/9*n = 15 // : 1/9
n = 15/1/9
n = 135
n = 135
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