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87.5/7 = x/35 // - x/35
87.5/7-(x/35) = 0
12.5-1/35*x = 0 // - 12.5
-1/35*x = -12.5 // : -1/35
x = -12.5/(-1/35)
x = 437.49997813
x = 437.49997813
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