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x in (-oo:+oo)
(8/15)*x = (2/15)*x-((4/15)*x)+8 // - (2/15)*x-((4/15)*x)+8
(8/15)*x-((2/15)*x)+(4/15)*x-8 = 0
(8/15)*x+(-2/15)*x+(4/15)*x-8 = 0
2/3*x-8 = 0 // + 8
2/3*x = 8 // : 2/3
x = 8/2/3
x = 12
x = 12
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