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4 = (2/9)*(4*x-2) // - (2/9)*(4*x-2)
4-((2/9)*(4*x-2)) = 0
(-2/9)*(4*x-2)+4 = 0
4-2/9*(4*x-2) = 0
4-2/9*(4*x-2) = 0
40/9-8/9*x = 0
40/9-8/9*x = 0
40/9-8/9*x = 0 // - 40/9
-8/9*x = -40/9 // : -8/9
x = -40/9/(-8/9)
x = 5
x = 5
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