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Simplifying (x + -3) + -4 = 21 Reorder the terms: (-3 + x) + -4 = 21 Remove parenthesis around (-3 + x) -3 + x + -4 = 21 Reorder the terms: -3 + -4 + x = 21 Combine like terms: -3 + -4 = -7 -7 + x = 21 Solving -7 + x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + x = 21 + 7 x = 21 + 7 Combine like terms: 21 + 7 = 28 x = 28 Simplifying x = 28
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