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x/6 = 2*x-78.5 // - 2*x-78.5
x/6-(2*x)+78.5 = 0
x/6-2*x+78.5 = 0
78.5-11/6*x = 0 // - 78.5
-11/6*x = -78.5 // : -11/6
x = -78.5/(-11/6)
x = 42.8181819
x = 42.8181819
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