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Simplifying 3(x + 7) + -9 = 0 Reorder the terms: 3(7 + x) + -9 = 0 (7 * 3 + x * 3) + -9 = 0 (21 + 3x) + -9 = 0 Reorder the terms: 21 + -9 + 3x = 0 Combine like terms: 21 + -9 = 12 12 + 3x = 0 Solving 12 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 0 + -12 3x = 0 + -12 Combine like terms: 0 + -12 = -12 3x = -12 Divide each side by '3'. x = -4 Simplifying x = -4
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