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Simplifying (7x + -9) * 9 = 4 Reorder the terms: (-9 + 7x) * 9 = 4 Reorder the terms for easier multiplication: 9(-9 + 7x) = 4 (-9 * 9 + 7x * 9) = 4 (-81 + 63x) = 4 Solving -81 + 63x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 63x = 4 + 81 Combine like terms: -81 + 81 = 0 0 + 63x = 4 + 81 63x = 4 + 81 Combine like terms: 4 + 81 = 85 63x = 85 Divide each side by '63'. x = 1.349206349 Simplifying x = 1.349206349
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