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Simplifying 2x + -21 = -21 + 7x Reorder the terms: -21 + 2x = -21 + 7x Add '21' to each side of the equation. -21 + 21 + 2x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 0 + 2x = -21 + 21 + 7x 2x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 2x = 0 + 7x 2x = 7x Solving 2x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 2x + -7x = 7x + -7x Combine like terms: 2x + -7x = -5x -5x = 7x + -7x Combine like terms: 7x + -7x = 0 -5x = 0 Divide each side by '-5'. x = 0 Simplifying x = 0
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