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Simplifying 5x + 3 + -2x = -21 Reorder the terms: 3 + 5x + -2x = -21 Combine like terms: 5x + -2x = 3x 3 + 3x = -21 Solving 3 + 3x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = -21 + -3 3x = -21 + -3 Combine like terms: -21 + -3 = -24 3x = -24 Divide each side by '3'. x = -8 Simplifying x = -8
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