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Simplifying 2(x + 5) + -3 = 21 Reorder the terms: 2(5 + x) + -3 = 21 (5 * 2 + x * 2) + -3 = 21 (10 + 2x) + -3 = 21 Reorder the terms: 10 + -3 + 2x = 21 Combine like terms: 10 + -3 = 7 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 = 14 2x = 14 Divide each side by '2'. x = 7 Simplifying x = 7
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