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8.9 = x/7 // - x/7
8.9-(x/7) = 0
8.9-1/7*x = 0 // - 8.9
-1/7*x = -8.9 // : -1/7
x = -8.9/(-1/7)
x = 62.30000125
x = 62.30000125
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