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Simplifying x2 + 6x + -40 = x2 Reorder the terms: -40 + 6x + x2 = x2 Add '-1x2' to each side of the equation. -40 + 6x + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -40 + 6x + 0 = x2 + -1x2 -40 + 6x = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -40 + 6x = 0 Solving -40 + 6x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 6x = 0 + 40 Combine like terms: -40 + 40 = 0 0 + 6x = 0 + 40 6x = 0 + 40 Combine like terms: 0 + 40 = 40 6x = 40 Divide each side by '6'. x = 6.666666667 Simplifying x = 6.666666667
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