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Simplifying 21X + -39 = 13X + -23 Reorder the terms: -39 + 21X = 13X + -23 Reorder the terms: -39 + 21X = -23 + 13X Solving -39 + 21X = -23 + 13X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-13X' to each side of the equation. -39 + 21X + -13X = -23 + 13X + -13X Combine like terms: 21X + -13X = 8X -39 + 8X = -23 + 13X + -13X Combine like terms: 13X + -13X = 0 -39 + 8X = -23 + 0 -39 + 8X = -23 Add '39' to each side of the equation. -39 + 39 + 8X = -23 + 39 Combine like terms: -39 + 39 = 0 0 + 8X = -23 + 39 8X = -23 + 39 Combine like terms: -23 + 39 = 16 8X = 16 Divide each side by '8'. X = 2 Simplifying X = 2
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