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Simplifying 9x + -20x + -15 = 21 Reorder the terms: -15 + 9x + -20x = 21 Combine like terms: 9x + -20x = -11x -15 + -11x = 21 Solving -15 + -11x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -11x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -11x = 21 + 15 -11x = 21 + 15 Combine like terms: 21 + 15 = 36 -11x = 36 Divide each side by '-11'. x = -3.272727273 Simplifying x = -3.272727273
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