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Simplifying -2x + 21 + 7x = 36 Reorder the terms: 21 + -2x + 7x = 36 Combine like terms: -2x + 7x = 5x 21 + 5x = 36 Solving 21 + 5x = 36 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 = 36 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 36 + -21 5x = 36 + -21 Combine like terms: 36 + -21 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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