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Simplifying 7x + -1(3x + 7) = 9 Reorder the terms: 7x + -1(7 + 3x) = 9 7x + (7 * -1 + 3x * -1) = 9 7x + (-7 + -3x) = 9 Reorder the terms: -7 + 7x + -3x = 9 Combine like terms: 7x + -3x = 4x -7 + 4x = 9 Solving -7 + 4x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4x = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = 9 + 7 4x = 9 + 7 Combine like terms: 9 + 7 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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