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Simplifying -4x + -9 = 21 + x Reorder the terms: -9 + -4x = 21 + x Solving -9 + -4x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -9 + -4x + -1x = 21 + x + -1x Combine like terms: -4x + -1x = -5x -9 + -5x = 21 + x + -1x Combine like terms: x + -1x = 0 -9 + -5x = 21 + 0 -9 + -5x = 21 Add '9' to each side of the equation. -9 + 9 + -5x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -5x = 21 + 9 -5x = 21 + 9 Combine like terms: 21 + 9 = 30 -5x = 30 Divide each side by '-5'. x = -6 Simplifying x = -6
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