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Simplifying 13 = X + -1(-21) Multiply -1 * -21 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 = 8 -1X = 8 Divide each side by '-1'. X = -8 Simplifying X = -8
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