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Simplifying 9 + 8x = -21 + 2x Solving 9 + 8x = -21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 9 + 8x + -2x = -21 + 2x + -2x Combine like terms: 8x + -2x = 6x 9 + 6x = -21 + 2x + -2x Combine like terms: 2x + -2x = 0 9 + 6x = -21 + 0 9 + 6x = -21 Add '-9' to each side of the equation. 9 + -9 + 6x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 6x = -21 + -9 6x = -21 + -9 Combine like terms: -21 + -9 = -30 6x = -30 Divide each side by '6'. x = -5 Simplifying x = -5
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