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Simplifying 21x + -9 = 11x + -39 Reorder the terms: -9 + 21x = 11x + -39 Reorder the terms: -9 + 21x = -39 + 11x Solving -9 + 21x = -39 + 11x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11x' to each side of the equation. -9 + 21x + -11x = -39 + 11x + -11x Combine like terms: 21x + -11x = 10x -9 + 10x = -39 + 11x + -11x Combine like terms: 11x + -11x = 0 -9 + 10x = -39 + 0 -9 + 10x = -39 Add '9' to each side of the equation. -9 + 9 + 10x = -39 + 9 Combine like terms: -9 + 9 = 0 0 + 10x = -39 + 9 10x = -39 + 9 Combine like terms: -39 + 9 = -30 10x = -30 Divide each side by '10'. x = -3 Simplifying x = -3
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