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Simplifying -5x + 3(x + 3) = 21 Reorder the terms: -5x + 3(3 + x) = 21 -5x + (3 * 3 + x * 3) = 21 -5x + (9 + 3x) = 21 Reorder the terms: 9 + -5x + 3x = 21 Combine like terms: -5x + 3x = -2x 9 + -2x = 21 Solving 9 + -2x = 21 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 + -2x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -2x = 21 + -9 -2x = 21 + -9 Combine like terms: 21 + -9 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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