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Simplifying 21a + 21 = 28 + 14 Reorder the terms: 21 + 21a = 28 + 14 Combine like terms: 28 + 14 = 42 21 + 21a = 42 Solving 21 + 21a = 42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 21a = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 21a = 42 + -21 21a = 42 + -21 Combine like terms: 42 + -21 = 21 21a = 21 Divide each side by '21'. a = 1 Simplifying a = 1
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