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7*(-(6*x)-1) = -427 // + 427
7*(-(6*x)-1)+427 = 0
7*(-6*x-1)+427 = 0
7*(-6*x-1)+427 = 0
420-42*x = 0
420-42*x = 0
420-42*x = 0 // - 420
-42*x = -420 // : -42
x = -420/(-42)
x = 10
x = 10
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