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Simplifying 25 = -21a + a + 5 Reorder the terms: 25 = 5 + -21a + a Combine like terms: -21a + a = -20a 25 = 5 + -20a Solving 25 = 5 + -20a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20a' to each side of the equation. 25 + 20a = 5 + -20a + 20a Combine like terms: -20a + 20a = 0 25 + 20a = 5 + 0 25 + 20a = 5 Add '-25' to each side of the equation. 25 + -25 + 20a = 5 + -25 Combine like terms: 25 + -25 = 0 0 + 20a = 5 + -25 20a = 5 + -25 Combine like terms: 5 + -25 = -20 20a = -20 Divide each side by '20'. a = -1 Simplifying a = -1
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