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Simplifying -21 = -9 + 2x Solving -21 = -9 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -21 + -2x = -9 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + -2x = -9 + 0 -21 + -2x = -9 Add '21' to each side of the equation. -21 + 21 + -2x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = -9 + 21 -2x = -9 + 21 Combine like terms: -9 + 21 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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