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Simplifying 21 = x + (x + -5) Reorder the terms: 21 = x + (-5 + x) Remove parenthesis around (-5 + x) 21 = x + -5 + x Reorder the terms: 21 = -5 + x + x Combine like terms: x + x = 2x 21 = -5 + 2x Solving 21 = -5 + 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. 21 + -2x = -5 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + -2x = -5 + 0 21 + -2x = -5 Add '-21' to each side of the equation. 21 + -21 + -2x = -5 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = -5 + -21 -2x = -5 + -21 Combine like terms: -5 + -21 = -26 -2x = -26 Divide each side by '-2'. x = 13 Simplifying x = 13
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