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Simplifying 13 + -21 = -2x Combine like terms: 13 + -21 = -8 -8 = -2x Solving -8 = -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -8 + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 -8 + 2x = 0 Add '8' to each side of the equation. -8 + 8 + 2x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 2x = 0 + 8 2x = 0 + 8 Combine like terms: 0 + 8 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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