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3.5/9 = x/15 // - x/15
3.5/9-(x/15) = 0
0.38888889-1/15*x = 0 // - 0.38888889
-1/15*x = -0.38888889 // : -1/15
x = -0.38888889/(-1/15)
x = 5.83333306
x = 5.83333306
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