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Simplifying 20 + (x + -4) = 20 Reorder the terms: 20 + (-4 + x) = 20 Remove parenthesis around (-4 + x) 20 + -4 + x = 20 Combine like terms: 20 + -4 = 16 16 + x = 20 Solving 16 + x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + x = 20 + -16 Combine like terms: 16 + -16 = 0 0 + x = 20 + -16 x = 20 + -16 Combine like terms: 20 + -16 = 4 x = 4 Simplifying x = 4
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