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Simplifying -1x + -21 = -15 Reorder the terms: -21 + -1x = -15 Solving -21 + -1x = -15 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 + -1x = -15 + 21 Combine like terms: -21 + 21 = 0 0 + -1x = -15 + 21 -1x = -15 + 21 Combine like terms: -15 + 21 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6
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