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Simplifying 9 + 21 = 2x + 8x Combine like terms: 9 + 21 = 30 30 = 2x + 8x Combine like terms: 2x + 8x = 10x 30 = 10x Solving 30 = 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 30 + -10x = 10x + -10x Combine like terms: 10x + -10x = 0 30 + -10x = 0 Add '-30' to each side of the equation. 30 + -30 + -10x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -10x = 0 + -30 -10x = 0 + -30 Combine like terms: 0 + -30 = -30 -10x = -30 Divide each side by '-10'. x = 3 Simplifying x = 3
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