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-1.28 = 9*x-(3500/42) // - 9*x-(3500/42)
3500/42-(9*x)-1.28 = 0
3500/42-9*x-1.28 = 0
82.05333333-9*x = 0 // - 82.05333333
-9*x = -82.05333333 // : -9
x = -82.05333333/(-9)
x = 9.11703704
x = 9.11703704
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