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Simplifying 8 + (x + -4) = 13 Reorder the terms: 8 + (-4 + x) = 13 Remove parenthesis around (-4 + x) 8 + -4 + x = 13 Combine like terms: 8 + -4 = 4 4 + x = 13 Solving 4 + x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 13 + -4 Combine like terms: 4 + -4 = 0 0 + x = 13 + -4 x = 13 + -4 Combine like terms: 13 + -4 = 9 x = 9 Simplifying x = 9
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