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2*x-((1/3)*x) = 15 // - 15
2*x-((1/3)*x)-15 = 0
2*x+(-1/3)*x-15 = 0
5/3*x-15 = 0 // + 15
5/3*x = 15 // : 5/3
x = 15/5/3
x = 9
x = 9
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