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Simplifying 21 = 25 + -4a Solving 21 = 25 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 21 + 4a = 25 + -4a + 4a Combine like terms: -4a + 4a = 0 21 + 4a = 25 + 0 21 + 4a = 25 Add '-21' to each side of the equation. 21 + -21 + 4a = 25 + -21 Combine like terms: 21 + -21 = 0 0 + 4a = 25 + -21 4a = 25 + -21 Combine like terms: 25 + -21 = 4 4a = 4 Divide each side by '4'. a = 1 Simplifying a = 1
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