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3.51/3 = x/7 // - x/7
3.51/3-(x/7) = 0
1.17-1/7*x = 0 // - 1.17
-1/7*x = -1.17 // : -1/7
x = -1.17/(-1/7)
x = 8.19000016
x = 8.19000016
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