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13.9 = x/6+12.5 // - x/6+12.5
13.9-(x/6)-12.5 = 0
1.4-1/6*x = 0 // - 1.4
-1/6*x = -1.4 // : -1/6
x = -1.4/(-1/6)
x = 8.39999983
x = 8.39999983
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