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Simplifying x + 21 = 87 + -1x Reorder the terms: 21 + x = 87 + -1x Solving 21 + x = 87 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 21 + x + x = 87 + -1x + x Combine like terms: x + x = 2x 21 + 2x = 87 + -1x + x Combine like terms: -1x + x = 0 21 + 2x = 87 + 0 21 + 2x = 87 Add '-21' to each side of the equation. 21 + -21 + 2x = 87 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 87 + -21 2x = 87 + -21 Combine like terms: 87 + -21 = 66 2x = 66 Divide each side by '2'. x = 33 Simplifying x = 33
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