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Simplifying 3 + (x + -4) = 20 Reorder the terms: 3 + (-4 + x) = 20 Remove parenthesis around (-4 + x) 3 + -4 + x = 20 Combine like terms: 3 + -4 = -1 -1 + x = 20 Solving -1 + x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 20 + 1 Combine like terms: -1 + 1 = 0 0 + x = 20 + 1 x = 20 + 1 Combine like terms: 20 + 1 = 21 x = 21 Simplifying x = 21
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