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Simplifying X2 + 15 = 90 Reorder the terms: 15 + X2 = 90 Solving 15 + X2 = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + X2 = 90 + -15 Combine like terms: 15 + -15 = 0 0 + X2 = 90 + -15 X2 = 90 + -15 Combine like terms: 90 + -15 = 75 X2 = 75 Simplifying X2 = 75 Take the square root of each side: X = {-8.660254038, 8.660254038}
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