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x in (-oo:+oo)
(2/3)*x+x+(2/3)*x+x = 260 // - 260
(2/3)*x+x+(2/3)*x+x-260 = 0
10/3*x-260 = 0 // + 260
10/3*x = 260 // : 10/3
x = 260/10/3
x = 78
x = 78
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