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Simplifying X + 12 + X = 90 Reorder the terms: 12 + X + X = 90 Combine like terms: X + X = 2X 12 + 2X = 90 Solving 12 + 2X = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2X = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 2X = 90 + -12 2X = 90 + -12 Combine like terms: 90 + -12 = 78 2X = 78 Divide each side by '2'. X = 39 Simplifying X = 39
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