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Simplifying 13 + 8 = x Combine like terms: 13 + 8 = 21 21 = x Solving 21 = 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 = x + -1x Combine like terms: x + -1x = 0 21 + -1x = 0 Add '-21' to each side of the equation. 21 + -21 + -1x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 0 + -21 -1x = 0 + -21 Combine like terms: 0 + -21 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21
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