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54/6 = x/2.5 // - x/2.5
54/6-(x/2.5) = 0
54/6-0.4*x = 0
9-0.4*x = 0 // - 9
-0.4*x = -9 // : -0.4
x = -9/(-0.4)
x = 22.5
x = 22.5
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