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5*x-28 = (2/6)*x // - (2/6)*x
5*x-((2/6)*x)-28 = 0
5*x+(-1/3)*x-28 = 0
14/3*x-28 = 0 // + 28
14/3*x = 28 // : 14/3
x = 28/14/3
x = 6
x = 6
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