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Simplifying -2(x + -6) + -21 = 0 Reorder the terms: -2(-6 + x) + -21 = 0 (-6 * -2 + x * -2) + -21 = 0 (12 + -2x) + -21 = 0 Reorder the terms: 12 + -21 + -2x = 0 Combine like terms: 12 + -21 = -9 -9 + -2x = 0 Solving -9 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = 0 + 9 -2x = 0 + 9 Combine like terms: 0 + 9 = 9 -2x = 9 Divide each side by '-2'. x = -4.5 Simplifying x = -4.5
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