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4-((2/3)*x) = 4*x-(16/3) // - 4*x-(16/3)
16/3-((2/3)*x)-(4*x)+4 = 0
(-2/3)*x-4*x+16/3+4 = 0
28/3-14/3*x = 0 // - 28/3
-14/3*x = -28/3 // : -14/3
x = -28/3/(-14/3)
x = 2
x = 2
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