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Simplifying 4x + x + 21 = 90 Reorder the terms: 21 + 4x + x = 90 Combine like terms: 4x + x = 5x 21 + 5x = 90 Solving 21 + 5x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 5x = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 90 + -21 5x = 90 + -21 Combine like terms: 90 + -21 = 69 5x = 69 Divide each side by '5'. x = 13.8 Simplifying x = 13.8
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