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Simplifying 2x + -6x + 21 = -13 Reorder the terms: 21 + 2x + -6x = -13 Combine like terms: 2x + -6x = -4x 21 + -4x = -13 Solving 21 + -4x = -13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -4x = -13 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = -13 + -21 -4x = -13 + -21 Combine like terms: -13 + -21 = -34 -4x = -34 Divide each side by '-4'. x = 8.5 Simplifying x = 8.5
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