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Simplifying 2(x + -5) + 13 = 21 Reorder the terms: 2(-5 + x) + 13 = 21 (-5 * 2 + x * 2) + 13 = 21 (-10 + 2x) + 13 = 21 Reorder the terms: -10 + 13 + 2x = 21 Combine like terms: -10 + 13 = 3 3 + 2x = 21 Solving 3 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = 21 + -3 2x = 21 + -3 Combine like terms: 21 + -3 = 18 2x = 18 Divide each side by '2'. x = 9 Simplifying x = 9
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