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Simplifying 8X + 21 = 2X + 129 Reorder the terms: 21 + 8X = 2X + 129 Reorder the terms: 21 + 8X = 129 + 2X Solving 21 + 8X = 129 + 2X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2X' to each side of the equation. 21 + 8X + -2X = 129 + 2X + -2X Combine like terms: 8X + -2X = 6X 21 + 6X = 129 + 2X + -2X Combine like terms: 2X + -2X = 0 21 + 6X = 129 + 0 21 + 6X = 129 Add '-21' to each side of the equation. 21 + -21 + 6X = 129 + -21 Combine like terms: 21 + -21 = 0 0 + 6X = 129 + -21 6X = 129 + -21 Combine like terms: 129 + -21 = 108 6X = 108 Divide each side by '6'. X = 18 Simplifying X = 18
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