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Simplifying 2(x + -7) = 21 Reorder the terms: 2(-7 + x) = 21 (-7 * 2 + x * 2) = 21 (-14 + 2x) = 21 Solving -14 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 2x = 21 + 14 Combine like terms: -14 + 14 = 0 0 + 2x = 21 + 14 2x = 21 + 14 Combine like terms: 21 + 14 = 35 2x = 35 Divide each side by '2'. x = 17.5 Simplifying x = 17.5
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