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Simplifying -1x + 21 = 28 Reorder the terms: 21 + -1x = 28 Solving 21 + -1x = 28 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 + -1x = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 28 + -21 -1x = 28 + -21 Combine like terms: 28 + -21 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7
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