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Simplifying -21 + -4x = 5x + 13 Reorder the terms: -21 + -4x = 13 + 5x Solving -21 + -4x = 13 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + -4x + -5x = 13 + 5x + -5x Combine like terms: -4x + -5x = -9x -21 + -9x = 13 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -9x = 13 + 0 -21 + -9x = 13 Add '21' to each side of the equation. -21 + 21 + -9x = 13 + 21 Combine like terms: -21 + 21 = 0 0 + -9x = 13 + 21 -9x = 13 + 21 Combine like terms: 13 + 21 = 34 -9x = 34 Divide each side by '-9'. x = -3.777777778 Simplifying x = -3.777777778
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