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Simplifying -13 = x + 21 Reorder the terms: -13 = 21 + x Solving -13 = 21 + 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. -13 + -1x = 21 + x + -1x Combine like terms: x + -1x = 0 -13 + -1x = 21 + 0 -13 + -1x = 21 Add '13' to each side of the equation. -13 + 13 + -1x = 21 + 13 Combine like terms: -13 + 13 = 0 0 + -1x = 21 + 13 -1x = 21 + 13 Combine like terms: 21 + 13 = 34 -1x = 34 Divide each side by '-1'. x = -34 Simplifying x = -34
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