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Simplifying -2x + -6 = 21 Reorder the terms: -6 + -2x = 21 Solving -6 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -2x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + -2x = 21 + 6 -2x = 21 + 6 Combine like terms: 21 + 6 = 27 -2x = 27 Divide each side by '-2'. x = -13.5 Simplifying x = -13.5
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