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5*x-(4*x)-(8/3) = 6*x // - 6*x
5*x-(4*x)-(6*x)-(8/3) = 0
5*x-4*x-6*x-8/3 = 0
-5*x-8/3 = 0 // + 8/3
-5*x = 8/3 // : -5
x = 8/3/(-5)
x = -8/15
x = -8/15
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