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Simplifying x + (x + -21) = 69 Reorder the terms: x + (-21 + x) = 69 Remove parenthesis around (-21 + x) x + -21 + x = 69 Reorder the terms: -21 + x + x = 69 Combine like terms: x + x = 2x -21 + 2x = 69 Solving -21 + 2x = 69 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2x = 69 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 69 + 21 2x = 69 + 21 Combine like terms: 69 + 21 = 90 2x = 90 Divide each side by '2'. x = 45 Simplifying x = 45
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