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78.5/100 = x/25 // - x/25
78.5/100-(x/25) = 0
0.785-1/25*x = 0 // - 0.785
-1/25*x = -0.785 // : -1/25
x = -0.785/(-1/25)
x = 19.625
x = 19.625
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