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Simplifying X + 21 = 13x + 87 Reorder the terms: 21 + X = 13x + 87 Reorder the terms: 21 + X = 87 + 13x Solving 21 + X = 87 + 13x Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + X = 87 + -21 + 13x Combine like terms: 21 + -21 = 0 0 + X = 87 + -21 + 13x X = 87 + -21 + 13x Combine like terms: 87 + -21 = 66 X = 66 + 13x Simplifying X = 66 + 13x
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