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Simplifying 3 + 21 = 3x + -15 Combine like terms: 3 + 21 = 24 24 = 3x + -15 Reorder the terms: 24 = -15 + 3x Solving 24 = -15 + 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. 24 + -3x = -15 + 3x + -3x Combine like terms: 3x + -3x = 0 24 + -3x = -15 + 0 24 + -3x = -15 Add '-24' to each side of the equation. 24 + -24 + -3x = -15 + -24 Combine like terms: 24 + -24 = 0 0 + -3x = -15 + -24 -3x = -15 + -24 Combine like terms: -15 + -24 = -39 -3x = -39 Divide each side by '-3'. x = 13 Simplifying x = 13
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