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Simplifying -45 + 9x + -5x = 39 Combine like terms: 9x + -5x = 4x -45 + 4x = 39 Solving -45 + 4x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 4x = 39 + 45 Combine like terms: -45 + 45 = 0 0 + 4x = 39 + 45 4x = 39 + 45 Combine like terms: 39 + 45 = 84 4x = 84 Divide each side by '4'. x = 21 Simplifying x = 21
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