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Simplifying 21 + -8x = 21 + x Add '-21' to each side of the equation. 21 + -21 + -8x = 21 + -21 + x Combine like terms: 21 + -21 = 0 0 + -8x = 21 + -21 + x -8x = 21 + -21 + x Combine like terms: 21 + -21 = 0 -8x = 0 + x -8x = x Solving -8x = 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. -8x + -1x = x + -1x Combine like terms: -8x + -1x = -9x -9x = x + -1x Combine like terms: x + -1x = 0 -9x = 0 Divide each side by '-9'. x = 0 Simplifying x = 0
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