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12-((1/3)*x) = 2 // - 2
12-((1/3)*x)-2 = 0
(-1/3)*x-2+12 = 0
10-1/3*x = 0 // - 10
-1/3*x = -10 // : -1/3
x = -10/(-1/3)
x = 30
x = 30
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