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Simplifying -39 = 7x + 2(-7x + 12) Reorder the terms: -39 = 7x + 2(12 + -7x) -39 = 7x + (12 * 2 + -7x * 2) -39 = 7x + (24 + -14x) Reorder the terms: -39 = 24 + 7x + -14x Combine like terms: 7x + -14x = -7x -39 = 24 + -7x Solving -39 = 24 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -39 + 7x = 24 + -7x + 7x Combine like terms: -7x + 7x = 0 -39 + 7x = 24 + 0 -39 + 7x = 24 Add '39' to each side of the equation. -39 + 39 + 7x = 24 + 39 Combine like terms: -39 + 39 = 0 0 + 7x = 24 + 39 7x = 24 + 39 Combine like terms: 24 + 39 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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