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Simplifying -11x + -9 + 9x = 21 Reorder the terms: -9 + -11x + 9x = 21 Combine like terms: -11x + 9x = -2x -9 + -2x = 21 Solving -9 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -2x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = 21 + 9 -2x = 21 + 9 Combine like terms: 21 + 9 = 30 -2x = 30 Divide each side by '-2'. x = -15 Simplifying x = -15
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