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Simplifying 439 = 2x + 21 Reorder the terms: 439 = 21 + 2x Solving 439 = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 439 + -2x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 439 + -2x = 21 + 0 439 + -2x = 21 Add '-439' to each side of the equation. 439 + -439 + -2x = 21 + -439 Combine like terms: 439 + -439 = 0 0 + -2x = 21 + -439 -2x = 21 + -439 Combine like terms: 21 + -439 = -418 -2x = -418 Divide each side by '-2'. x = 209 Simplifying x = 209
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