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18-((2/3)*x) = 12 // - 12
18-((2/3)*x)-12 = 0
(-2/3)*x-12+18 = 0
6-2/3*x = 0 // - 6
-2/3*x = -6 // : -2/3
x = -6/(-2/3)
x = 9
x = 9
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