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3*4.5 = x/4.5 // - x/4.5
3*4.5-(x/4.5) = 0
3*4.5-0.22222222*x = 0
13.5-0.22222222*x = 0 // - 13.5
-0.22222222*x = -13.5 // : -0.22222222
x = -13.5/(-0.22222222)
x = 60.75000061
x = 60.75000061
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