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Simplifying -39 = 5x + 3(-5x + 7) Reorder the terms: -39 = 5x + 3(7 + -5x) -39 = 5x + (7 * 3 + -5x * 3) -39 = 5x + (21 + -15x) Reorder the terms: -39 = 21 + 5x + -15x Combine like terms: 5x + -15x = -10x -39 = 21 + -10x Solving -39 = 21 + -10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10x' to each side of the equation. -39 + 10x = 21 + -10x + 10x Combine like terms: -10x + 10x = 0 -39 + 10x = 21 + 0 -39 + 10x = 21 Add '39' to each side of the equation. -39 + 39 + 10x = 21 + 39 Combine like terms: -39 + 39 = 0 0 + 10x = 21 + 39 10x = 21 + 39 Combine like terms: 21 + 39 = 60 10x = 60 Divide each side by '10'. x = 6 Simplifying x = 6
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