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Simplifying -21 + -2x = 5x + 9 Reorder the terms: -21 + -2x = 9 + 5x Solving -21 + -2x = 9 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + -2x + -5x = 9 + 5x + -5x Combine like terms: -2x + -5x = -7x -21 + -7x = 9 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -7x = 9 + 0 -21 + -7x = 9 Add '21' to each side of the equation. -21 + 21 + -7x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -7x = 9 + 21 -7x = 9 + 21 Combine like terms: 9 + 21 = 30 -7x = 30 Divide each side by '-7'. x = -4.285714286 Simplifying x = -4.285714286
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