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Simplifying 15 = -21 + -3x Solving 15 = -21 + -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. 15 + 3x = -21 + -3x + 3x Combine like terms: -3x + 3x = 0 15 + 3x = -21 + 0 15 + 3x = -21 Add '-15' to each side of the equation. 15 + -15 + 3x = -21 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = -21 + -15 3x = -21 + -15 Combine like terms: -21 + -15 = -36 3x = -36 Divide each side by '3'. x = -12 Simplifying x = -12
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