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