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Simplifying 7x + -21 = 5x + 4 Reorder the terms: -21 + 7x = 5x + 4 Reorder the terms: -21 + 7x = 4 + 5x Solving -21 + 7x = 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 + 7x + -5x = 4 + 5x + -5x Combine like terms: 7x + -5x = 2x -21 + 2x = 4 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + 2x = 4 + 0 -21 + 2x = 4 Add '21' to each side of the equation. -21 + 21 + 2x = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 4 + 21 2x = 4 + 21 Combine like terms: 4 + 21 = 25 2x = 25 Divide each side by '2'. x = 12.5 Simplifying x = 12.5
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