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Simplifying 21 = 5 + X Solving 21 = 5 + X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1X' to each side of the equation. 21 + -1X = 5 + X + -1X Combine like terms: X + -1X = 0 21 + -1X = 5 + 0 21 + -1X = 5 Add '-21' to each side of the equation. 21 + -21 + -1X = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -1X = 5 + -21 -1X = 5 + -21 Combine like terms: 5 + -21 = -16 -1X = -16 Divide each side by '-1'. X = 16 Simplifying X = 16
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