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4.5/1 = x/3 // - x/3
4.5/1-(x/3) = 0
4.5-(x/3) = 0
4.5-1/3*x = 0 // - 4.5
-1/3*x = -4.5 // : -1/3
x = -4.5/(-1/3)
x = 13.50000014
x = 13.50000014
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