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Simplifying 2x + 6 + 5x + 21 = 90 Reorder the terms: 6 + 21 + 2x + 5x = 90 Combine like terms: 6 + 21 = 27 27 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x 27 + 7x = 90 Solving 27 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 7x = 90 + -27 Combine like terms: 27 + -27 = 0 0 + 7x = 90 + -27 7x = 90 + -27 Combine like terms: 90 + -27 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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