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Simplifying 21 = -2x + 7x + -4 Reorder the terms: 21 = -4 + -2x + 7x Combine like terms: -2x + 7x = 5x 21 = -4 + 5x Solving 21 = -4 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + -5x = -4 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -5x = -4 + 0 21 + -5x = -4 Add '-21' to each side of the equation. 21 + -21 + -5x = -4 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = -4 + -21 -5x = -4 + -21 Combine like terms: -4 + -21 = -25 -5x = -25 Divide each side by '-5'. x = 5 Simplifying x = 5
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