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(2/3)*(9-(2*x)) = -30 // + 30
(2/3)*(9-(2*x))+30 = 0
(2/3)*(9-2*x)+30 = 0
2/3*(9-2*x)+30 = 0
2/3*(9-2*x)+30 = 0
36-4/3*x = 0
36-4/3*x = 0
36-4/3*x = 0 // - 36
-4/3*x = -36 // : -4/3
x = -36/(-4/3)
x = 27
x = 27
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