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7.5/10 = x/5 // - x/5
7.5/10-(x/5) = 0
0.75-1/5*x = 0 // - 0.75
-1/5*x = -0.75 // : -1/5
x = -0.75/(-1/5)
x = 3.75
x = 3.75
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