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Simplifying 9 + 3x = 21x Solving 9 + 3x = 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 9 + 3x + -21x = 21x + -21x Combine like terms: 3x + -21x = -18x 9 + -18x = 21x + -21x Combine like terms: 21x + -21x = 0 9 + -18x = 0 Add '-9' to each side of the equation. 9 + -9 + -18x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -18x = 0 + -9 -18x = 0 + -9 Combine like terms: 0 + -9 = -9 -18x = -9 Divide each side by '-18'. x = 0.5 Simplifying x = 0.5
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