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Simplifying -13 + -3x = 6x + 21 Reorder the terms: -13 + -3x = 21 + 6x Solving -13 + -3x = 21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -13 + -3x + -6x = 21 + 6x + -6x Combine like terms: -3x + -6x = -9x -13 + -9x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 -13 + -9x = 21 + 0 -13 + -9x = 21 Add '13' to each side of the equation. -13 + 13 + -9x = 21 + 13 Combine like terms: -13 + 13 = 0 0 + -9x = 21 + 13 -9x = 21 + 13 Combine like terms: 21 + 13 = 34 -9x = 34 Divide each side by '-9'. x = -3.777777778 Simplifying x = -3.777777778
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