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Simplifying x2 + -4x + 40 = x2 Reorder the terms: 40 + -4x + x2 = x2 Add '-1x2' to each side of the equation. 40 + -4x + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 40 + -4x + 0 = x2 + -1x2 40 + -4x = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 40 + -4x = 0 Solving 40 + -4x = 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 + -4x = 0 + -40 Combine like terms: 40 + -40 = 0 0 + -4x = 0 + -40 -4x = 0 + -40 Combine like terms: 0 + -40 = -40 -4x = -40 Divide each side by '-4'. x = 10 Simplifying x = 10
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