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-25.8 = x/7-3.4 // - x/7-3.4
3.4-(x/7)-25.8 = 0
-1/7*x-22.4 = 0 // + 22.4
-1/7*x = 22.4 // : -1/7
x = 22.4/(-1/7)
x = -156.80000314
x = -156.80000314
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