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Simplifying 21 + 25a = 28 + 18a Solving 21 + 25a = 28 + 18a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18a' to each side of the equation. 21 + 25a + -18a = 28 + 18a + -18a Combine like terms: 25a + -18a = 7a 21 + 7a = 28 + 18a + -18a Combine like terms: 18a + -18a = 0 21 + 7a = 28 + 0 21 + 7a = 28 Add '-21' to each side of the equation. 21 + -21 + 7a = 28 + -21 Combine like terms: 21 + -21 = 0 0 + 7a = 28 + -21 7a = 28 + -21 Combine like terms: 28 + -21 = 7 7a = 7 Divide each side by '7'. a = 1 Simplifying a = 1
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