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Simplifying x + 3 + -3 + -8 = 13 Reorder the terms: 3 + -3 + -8 + x = 13 Combine like terms: 3 + -3 = 0 0 + -8 + x = 13 -8 + x = 13 Solving -8 + x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 13 + 8 Combine like terms: -8 + 8 = 0 0 + x = 13 + 8 x = 13 + 8 Combine like terms: 13 + 8 = 21 x = 21 Simplifying x = 21
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