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Simplifying 7x + 4 = 2x + 21 Reorder the terms: 4 + 7x = 2x + 21 Reorder the terms: 4 + 7x = 21 + 2x Solving 4 + 7x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 4 + 7x + -2x = 21 + 2x + -2x Combine like terms: 7x + -2x = 5x 4 + 5x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 4 + 5x = 21 + 0 4 + 5x = 21 Add '-4' to each side of the equation. 4 + -4 + 5x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 5x = 21 + -4 5x = 21 + -4 Combine like terms: 21 + -4 = 17 5x = 17 Divide each side by '5'. x = 3.4 Simplifying x = 3.4
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