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Simplifying -1(2x + 7) = 21 Reorder the terms: -1(7 + 2x) = 21 (7 * -1 + 2x * -1) = 21 (-7 + -2x) = 21 Solving -7 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -2x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = 21 + 7 -2x = 21 + 7 Combine like terms: 21 + 7 = 28 -2x = 28 Divide each side by '-2'. x = -14 Simplifying x = -14
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