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Simplifying 3(x + 2) + -21 = 0 Reorder the terms: 3(2 + x) + -21 = 0 (2 * 3 + x * 3) + -21 = 0 (6 + 3x) + -21 = 0 Reorder the terms: 6 + -21 + 3x = 0 Combine like terms: 6 + -21 = -15 -15 + 3x = 0 Solving -15 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 0 + 15 3x = 0 + 15 Combine like terms: 0 + 15 = 15 3x = 15 Divide each side by '3'. x = 5 Simplifying x = 5
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