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Simplifying (x + -1) + (2x + 1) = 21 Reorder the terms: (-1 + x) + (2x + 1) = 21 Remove parenthesis around (-1 + x) -1 + x + (2x + 1) = 21 Reorder the terms: -1 + x + (1 + 2x) = 21 Remove parenthesis around (1 + 2x) -1 + x + 1 + 2x = 21 Reorder the terms: -1 + 1 + x + 2x = 21 Combine like terms: -1 + 1 = 0 0 + x + 2x = 21 x + 2x = 21 Combine like terms: x + 2x = 3x 3x = 21 Solving 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '3'. x = 7 Simplifying x = 7
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