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9*(0.5*6+9) = x/9-12 // - x/9-12
9*(0.5*6+9)-(x/9)+12 = 0
120-1/9*x = 0 // - 120
-1/9*x = -120 // : -1/9
x = -120/(-1/9)
x = 1080
x = 1080
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