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Simplifying (x + 4) + (2x + -1) = 12 Reorder the terms: (4 + x) + (2x + -1) = 12 Remove parenthesis around (4 + x) 4 + x + (2x + -1) = 12 Reorder the terms: 4 + x + (-1 + 2x) = 12 Remove parenthesis around (-1 + 2x) 4 + x + -1 + 2x = 12 Reorder the terms: 4 + -1 + x + 2x = 12 Combine like terms: 4 + -1 = 3 3 + x + 2x = 12 Combine like terms: x + 2x = 3x 3 + 3x = 12 Solving 3 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = 12 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 12 + -3 3x = 12 + -3 Combine like terms: 12 + -3 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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