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