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Simplifying -6x + 3(x + 7) = 39 Reorder the terms: -6x + 3(7 + x) = 39 -6x + (7 * 3 + x * 3) = 39 -6x + (21 + 3x) = 39 Reorder the terms: 21 + -6x + 3x = 39 Combine like terms: -6x + 3x = -3x 21 + -3x = 39 Solving 21 + -3x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3x = 39 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 39 + -21 -3x = 39 + -21 Combine like terms: 39 + -21 = 18 -3x = 18 Divide each side by '-3'. x = -6 Simplifying x = -6
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