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11.2 = x/7-8.4 // - x/7-8.4
8.4-(x/7)+11.2 = 0
19.6-1/7*x = 0 // - 19.6
-1/7*x = -19.6 // : -1/7
x = -19.6/(-1/7)
x = 137.20000274
x = 137.20000274
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