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Simplifying -3x + -15 = 21 Reorder the terms: -15 + -3x = 21 Solving -15 + -3x = 21 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 = 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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