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18 = 24*(x/6.9) // - 24*(x/6.9)
18-(24*(x/6.9)) = 0
18-3.47826087*x = 0
18-3.47826087*x = 0 // - 18
-3.47826087*x = -18 // : -3.47826087
x = -18/(-3.47826087)
x = 5.175
x = 5.175
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