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