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Simplifying x + 21 = 5x + 9 Reorder the terms: 21 + x = 5x + 9 Reorder the terms: 21 + x = 9 + 5x Solving 21 + x = 9 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + x + -5x = 9 + 5x + -5x Combine like terms: x + -5x = -4x 21 + -4x = 9 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -4x = 9 + 0 21 + -4x = 9 Add '-21' to each side of the equation. 21 + -21 + -4x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 9 + -21 -4x = 9 + -21 Combine like terms: 9 + -21 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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