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Simplifying 21 + -7x = -9x + -13 Reorder the terms: 21 + -7x = -13 + -9x Solving 21 + -7x = -13 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 21 + -7x + 9x = -13 + -9x + 9x Combine like terms: -7x + 9x = 2x 21 + 2x = -13 + -9x + 9x Combine like terms: -9x + 9x = 0 21 + 2x = -13 + 0 21 + 2x = -13 Add '-21' to each side of the equation. 21 + -21 + 2x = -13 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = -13 + -21 2x = -13 + -21 Combine like terms: -13 + -21 = -34 2x = -34 Divide each side by '2'. x = -17 Simplifying x = -17
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