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4 = 2*x+8/10 // - 2*x+8/10
4-(2*x)-(8/10) = 0
4-2*x-4/5 = 0
16/5-2*x = 0 // - 16/5
-2*x = -16/5 // : -2
x = -16/5/(-2)
x = 8/5
x = 8/5
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