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Simplifying x + 72 + x = 90 Reorder the terms: 72 + x + x = 90 Combine like terms: x + x = 2x 72 + 2x = 90 Solving 72 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-72' to each side of the equation. 72 + -72 + 2x = 90 + -72 Combine like terms: 72 + -72 = 0 0 + 2x = 90 + -72 2x = 90 + -72 Combine like terms: 90 + -72 = 18 2x = 18 Divide each side by '2'. x = 9 Simplifying x = 9
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