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Simplifying 13 = 0.5(X + 21) Reorder the terms: 13 = 0.5(21 + X) 13 = (21 * 0.5 + X * 0.5) 13 = (10.5 + 0.5X) Solving 13 = 10.5 + 0.5X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5X' to each side of the equation. 13 + -0.5X = 10.5 + 0.5X + -0.5X Combine like terms: 0.5X + -0.5X = 0.0 13 + -0.5X = 10.5 + 0.0 13 + -0.5X = 10.5 Add '-13' to each side of the equation. 13 + -13 + -0.5X = 10.5 + -13 Combine like terms: 13 + -13 = 0 0 + -0.5X = 10.5 + -13 -0.5X = 10.5 + -13 Combine like terms: 10.5 + -13 = -2.5 -0.5X = -2.5 Divide each side by '-0.5'. X = 5 Simplifying X = 5
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