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Simplifying 3(x + 4) + -21 = 15 Reorder the terms: 3(4 + x) + -21 = 15 (4 * 3 + x * 3) + -21 = 15 (12 + 3x) + -21 = 15 Reorder the terms: 12 + -21 + 3x = 15 Combine like terms: 12 + -21 = -9 -9 + 3x = 15 Solving -9 + 3x = 15 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 + 3x = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 3x = 15 + 9 3x = 15 + 9 Combine like terms: 15 + 9 = 24 3x = 24 Divide each side by '3'. x = 8 Simplifying x = 8
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