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Simplifying 21 = 8 + -1x Solving 21 = 8 + -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 = 8 + -1x + x Combine like terms: -1x + x = 0 21 + x = 8 + 0 21 + x = 8 Add '-21' to each side of the equation. 21 + -21 + x = 8 + -21 Combine like terms: 21 + -21 = 0 0 + x = 8 + -21 x = 8 + -21 Combine like terms: 8 + -21 = -13 x = -13 Simplifying x = -13
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