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Simplifying 80 = x * 5x Reorder the terms for easier multiplication: 80 = 5x * x Multiply x * x 80 = 5x2 Solving 80 = 5x2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x2' to each side of the equation. 80 + -5x2 = 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 80 + -5x2 = 0 Add '-80' to each side of the equation. 80 + -80 + -5x2 = 0 + -80 Combine like terms: 80 + -80 = 0 0 + -5x2 = 0 + -80 -5x2 = 0 + -80 Combine like terms: 0 + -80 = -80 -5x2 = -80 Divide each side by '-5'. x2 = 16 Simplifying x2 = 16 Take the square root of each side: x = {-4, 4}
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