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Simplifying x(x + -4) + 56 = x * x Reorder the terms: x(-4 + x) + 56 = x * x (-4 * x + x * x) + 56 = x * x (-4x + x2) + 56 = x * x Reorder the terms: 56 + -4x + x2 = x * x Multiply x * x 56 + -4x + x2 = x2 Add '-1x2' to each side of the equation. 56 + -4x + x2 + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 56 + -4x + 0 = x2 + -1x2 56 + -4x = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 56 + -4x = 0 Solving 56 + -4x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + -4x = 0 + -56 Combine like terms: 56 + -56 = 0 0 + -4x = 0 + -56 -4x = 0 + -56 Combine like terms: 0 + -56 = -56 -4x = -56 Divide each side by '-4'. x = 14 Simplifying x = 14
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