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Simplifying (x + 7) + -4 = 13 Reorder the terms: (7 + x) + -4 = 13 Remove parenthesis around (7 + x) 7 + x + -4 = 13 Reorder the terms: 7 + -4 + x = 13 Combine like terms: 7 + -4 = 3 3 + x = 13 Solving 3 + x = 13 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 + x = 13 + -3 Combine like terms: 3 + -3 = 0 0 + x = 13 + -3 x = 13 + -3 Combine like terms: 13 + -3 = 10 x = 10 Simplifying x = 10
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