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12-((2/3)*x) = 8 // - 8
12-((2/3)*x)-8 = 0
(-2/3)*x-8+12 = 0
4-2/3*x = 0 // - 4
-2/3*x = -4 // : -2/3
x = -4/(-2/3)
x = 6
x = 6
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