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Simplifying -21 + x = 9x Solving -21 + x = 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 + x + -9x = 9x + -9x Combine like terms: x + -9x = -8x -21 + -8x = 9x + -9x Combine like terms: 9x + -9x = 0 -21 + -8x = 0 Add '21' to each side of the equation. -21 + 21 + -8x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -8x = 0 + 21 -8x = 0 + 21 Combine like terms: 0 + 21 = 21 -8x = 21 Divide each side by '-8'. x = -2.625 Simplifying x = -2.625
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