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Simplifying 21 = 6(x + 2) + -3 Reorder the terms: 21 = 6(2 + x) + -3 21 = (2 * 6 + x * 6) + -3 21 = (12 + 6x) + -3 Reorder the terms: 21 = 12 + -3 + 6x Combine like terms: 12 + -3 = 9 21 = 9 + 6x Solving 21 = 9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + -6x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -6x = 9 + 0 21 + -6x = 9 Add '-21' to each side of the equation. 21 + -21 + -6x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = 9 + -21 -6x = 9 + -21 Combine like terms: 9 + -21 = -12 -6x = -12 Divide each side by '-6'. x = 2 Simplifying x = 2
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