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Simplifying -13x + -21 = 15 Reorder the terms: -21 + -13x = 15 Solving -21 + -13x = 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 + -13x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -13x = 15 + 21 -13x = 15 + 21 Combine like terms: 15 + 21 = 36 -13x = 36 Divide each side by '-13'. x = -2.769230769 Simplifying x = -2.769230769
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