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Simplifying -1 + 13 + -21 = x Combine like terms: -1 + 13 = 12 12 + -21 = x Combine like terms: 12 + -21 = -9 -9 = x Solving -9 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -9 + -1x = x + -1x Combine like terms: x + -1x = 0 -9 + -1x = 0 Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9
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