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Simplifying 7x + -1(3x + 9) = 0 Reorder the terms: 7x + -1(9 + 3x) = 0 7x + (9 * -1 + 3x * -1) = 0 7x + (-9 + -3x) = 0 Reorder the terms: -9 + 7x + -3x = 0 Combine like terms: 7x + -3x = 4x -9 + 4x = 0 Solving -9 + 4x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 4x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 4x = 0 + 9 4x = 0 + 9 Combine like terms: 0 + 9 = 9 4x = 9 Divide each side by '4'. x = 2.25 Simplifying x = 2.25
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