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Simplifying x + -1(21) = 9 Multiply -1 * 21 x + -21 = 9 Reorder the terms: -21 + x = 9 Solving -21 + x = 9 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 = 9 + 21 Combine like terms: -21 + 21 = 0 0 + x = 9 + 21 x = 9 + 21 Combine like terms: 9 + 21 = 30 x = 30 Simplifying x = 30
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