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Simplifying 7x + 1 + 3 = 21 Reorder the terms: 1 + 3 + 7x = 21 Combine like terms: 1 + 3 = 4 4 + 7x = 21 Solving 4 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 21 + -4 7x = 21 + -4 Combine like terms: 21 + -4 = 17 7x = 17 Divide each side by '7'. x = 2.428571429 Simplifying x = 2.428571429
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