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x in (-oo:+oo)
x+x+(7/9)*x+11 = 711 // - 711
x+x+(7/9)*x-711+11 = 0
25/9*x-700 = 0 // + 700
25/9*x = 700 // : 25/9
x = 700/25/9
x = 252
x = 252
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