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Simplifying x3 + -8x + 4 = x(x2 + -2) + -20 Reorder the terms: 4 + -8x + x3 = x(x2 + -2) + -20 Reorder the terms: 4 + -8x + x3 = x(-2 + x2) + -20 4 + -8x + x3 = (-2 * x + x2 * x) + -20 4 + -8x + x3 = (-2x + x3) + -20 Reorder the terms: 4 + -8x + x3 = -20 + -2x + x3 Add '-1x3' to each side of the equation. 4 + -8x + x3 + -1x3 = -20 + -2x + x3 + -1x3 Combine like terms: x3 + -1x3 = 0 4 + -8x + 0 = -20 + -2x + x3 + -1x3 4 + -8x = -20 + -2x + x3 + -1x3 Combine like terms: x3 + -1x3 = 0 4 + -8x = -20 + -2x + 0 4 + -8x = -20 + -2x Solving 4 + -8x = -20 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 4 + -8x + 2x = -20 + -2x + 2x Combine like terms: -8x + 2x = -6x 4 + -6x = -20 + -2x + 2x Combine like terms: -2x + 2x = 0 4 + -6x = -20 + 0 4 + -6x = -20 Add '-4' to each side of the equation. 4 + -4 + -6x = -20 + -4 Combine like terms: 4 + -4 = 0 0 + -6x = -20 + -4 -6x = -20 + -4 Combine like terms: -20 + -4 = -24 -6x = -24 Divide each side by '-6'. x = 4 Simplifying x = 4
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