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Simplifying (x + -3) * 2 = 21 Reorder the terms: (-3 + x) * 2 = 21 Reorder the terms for easier multiplication: 2(-3 + x) = 21 (-3 * 2 + x * 2) = 21 (-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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