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60/21.5 = x/18 // - x/18
60/21.5-(x/18) = 0
2.79069767-1/18*x = 0 // - 2.79069767
-1/18*x = -2.79069767 // : -1/18
x = -2.79069767/(-1/18)
x = 50.23255404
x = 50.23255404
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