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17 = (1/3)*(9*x-12) // - (1/3)*(9*x-12)
17-((1/3)*(9*x-12)) = 0
(-1/3)*(9*x-12)+17 = 0
17-1/3*(9*x-12) = 0
17-1/3*(9*x-12) = 0
21-3*x = 0
21-3*x = 0
21-3*x = 0 // - 21
-3*x = -21 // : -3
x = -21/(-3)
x = 7
x = 7
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