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5.8 = x/7+6.3 // - x/7+6.3
5.8-(x/7)-6.3 = 0
-1/7*x-0.5 = 0 // + 0.5
-1/7*x = 0.5 // : -1/7
x = 0.5/(-1/7)
x = -3.50000007
x = -3.50000007
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