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Simplifying -21 = 4 + 3(x + 8) Reorder the terms: -21 = 4 + 3(8 + x) -21 = 4 + (8 * 3 + x * 3) -21 = 4 + (24 + 3x) Combine like terms: 4 + 24 = 28 -21 = 28 + 3x Solving -21 = 28 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -21 + -3x = 28 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + -3x = 28 + 0 -21 + -3x = 28 Add '21' to each side of the equation. -21 + 21 + -3x = 28 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 28 + 21 -3x = 28 + 21 Combine like terms: 28 + 21 = 49 -3x = 49 Divide each side by '-3'. x = -16.33333333 Simplifying x = -16.33333333
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