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Simplifying x + x * 3 + x + 21 = 86 Reorder the terms for easier multiplication: x + 3x + x + 21 = 86 Reorder the terms: 21 + x + 3x + x = 86 Combine like terms: x + 3x = 4x 21 + 4x + x = 86 Combine like terms: 4x + x = 5x 21 + 5x = 86 Solving 21 + 5x = 86 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 = 86 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 86 + -21 5x = 86 + -21 Combine like terms: 86 + -21 = 65 5x = 65 Divide each side by '5'. x = 13 Simplifying x = 13
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