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Simplifying 21 + x = 5x + 3 Reorder the terms: 21 + x = 3 + 5x Solving 21 + x = 3 + 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 = 3 + 5x + -5x Combine like terms: x + -5x = -4x 21 + -4x = 3 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -4x = 3 + 0 21 + -4x = 3 Add '-21' to each side of the equation. 21 + -21 + -4x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 3 + -21 -4x = 3 + -21 Combine like terms: 3 + -21 = -18 -4x = -18 Divide each side by '-4'. x = 4.5 Simplifying x = 4.5
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