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12-(x/34) = 40/85 // - 40/85
12-(x/34)-(40/85) = 0
12-(x/34)-8/17 = 0
196/17-1/34*x = 0 // - 196/17
-1/34*x = -196/17 // : -1/34
x = -196/17/(-1/34)
x = 392
x = 392
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