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Simplifying 7x + -9 + -4(x + -1) = 28 Reorder the terms: 7x + -9 + -4(-1 + x) = 28 7x + -9 + (-1 * -4 + x * -4) = 28 7x + -9 + (4 + -4x) = 28 Reorder the terms: -9 + 4 + 7x + -4x = 28 Combine like terms: -9 + 4 = -5 -5 + 7x + -4x = 28 Combine like terms: 7x + -4x = 3x -5 + 3x = 28 Solving -5 + 3x = 28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 3x = 28 + 5 Combine like terms: -5 + 5 = 0 0 + 3x = 28 + 5 3x = 28 + 5 Combine like terms: 28 + 5 = 33 3x = 33 Divide each side by '3'. x = 11 Simplifying x = 11

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