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6*x-((2/3)*x) = 80 // - 80
6*x-((2/3)*x)-80 = 0
6*x+(-2/3)*x-80 = 0
16/3*x-80 = 0 // + 80
16/3*x = 80 // : 16/3
x = 80/16/3
x = 15
x = 15
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