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2/3-4-1 = x/12 // - x/12
2/3-(x/12)-4-1 = 0
-1/12*x-13/3 = 0 // + 13/3
-1/12*x = 13/3 // : -1/12
x = 13/3/(-1/12)
x = -52
x = -52
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