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Simplifying 21 = x + 4x Combine like terms: x + 4x = 5x 21 = 5x Solving 21 = 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 + -5x = 5x + -5x Combine like terms: 5x + -5x = 0 21 + -5x = 0 Add '-21' to each side of the equation. 21 + -21 + -5x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = 0 + -21 -5x = 0 + -21 Combine like terms: 0 + -21 = -21 -5x = -21 Divide each side by '-5'. x = 4.2 Simplifying x = 4.2
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