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Simplifying 21 = -6x + 39 Reorder the terms: 21 = 39 + -6x Solving 21 = 39 + -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 = 39 + -6x + 6x Combine like terms: -6x + 6x = 0 21 + 6x = 39 + 0 21 + 6x = 39 Add '-21' to each side of the equation. 21 + -21 + 6x = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = 39 + -21 6x = 39 + -21 Combine like terms: 39 + -21 = 18 6x = 18 Divide each side by '6'. x = 3 Simplifying x = 3
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