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Simplifying x + 2 = 21 + -2x Reorder the terms: 2 + x = 21 + -2x Solving 2 + x = 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. 2 + x + 2x = 21 + -2x + 2x Combine like terms: x + 2x = 3x 2 + 3x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 2 + 3x = 21 + 0 2 + 3x = 21 Add '-2' to each side of the equation. 2 + -2 + 3x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + 3x = 21 + -2 3x = 21 + -2 Combine like terms: 21 + -2 = 19 3x = 19 Divide each side by '3'. x = 6.333333333 Simplifying x = 6.333333333
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