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4*(x-(2/3)) = 18 // - 18
4*(x-(2/3))-18 = 0
4*(x-2/3)-18 = 0
4*(x-2/3)-18 = 0
4*x-62/3 = 0
4*x-62/3 = 0
4*x-62/3 = 0 // + 62/3
4*x = 62/3 // : 4
x = 62/3/4
x = 31/6
x = 31/6
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