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Simplifying 21 + 9x + -1(5x + -7) = -8 Reorder the terms: 21 + 9x + -1(-7 + 5x) = -8 21 + 9x + (-7 * -1 + 5x * -1) = -8 21 + 9x + (7 + -5x) = -8 Reorder the terms: 21 + 7 + 9x + -5x = -8 Combine like terms: 21 + 7 = 28 28 + 9x + -5x = -8 Combine like terms: 9x + -5x = 4x 28 + 4x = -8 Solving 28 + 4x = -8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 4x = -8 + -28 Combine like terms: 28 + -28 = 0 0 + 4x = -8 + -28 4x = -8 + -28 Combine like terms: -8 + -28 = -36 4x = -36 Divide each side by '4'. x = -9 Simplifying x = -9
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