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Simplifying 21 = 9 + -1x Solving 21 = 9 + -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 = 9 + -1x + x Combine like terms: -1x + x = 0 21 + x = 9 + 0 21 + x = 9 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 = -12 x = -12 Simplifying x = -12
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