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4/5 = 2*x-4 // - 2*x-4
4/5-(2*x)+4 = 0
4/5-2*x+4 = 0
24/5-2*x = 0 // - 24/5
-2*x = -24/5 // : -2
x = -24/5/(-2)
x = 12/5
x = 12/5
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