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Simplifying -21 + -9x = 9x + 15 Reorder the terms: -21 + -9x = 15 + 9x Solving -21 + -9x = 15 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -21 + -9x + -9x = 15 + 9x + -9x Combine like terms: -9x + -9x = -18x -21 + -18x = 15 + 9x + -9x Combine like terms: 9x + -9x = 0 -21 + -18x = 15 + 0 -21 + -18x = 15 Add '21' to each side of the equation. -21 + 21 + -18x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -18x = 15 + 21 -18x = 15 + 21 Combine like terms: 15 + 21 = 36 -18x = 36 Divide each side by '-18'. x = -2 Simplifying x = -2
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