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(1/3)*(9*x-3) = -1 // + 1
(1/3)*(9*x-3)+1 = 0
1/3*(9*x-3)+1 = 0
1/3*(9*x-3)+1 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
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