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Simplifying 21 + 5a = 8a Solving 21 + 5a = 8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8a' to each side of the equation. 21 + 5a + -8a = 8a + -8a Combine like terms: 5a + -8a = -3a 21 + -3a = 8a + -8a Combine like terms: 8a + -8a = 0 21 + -3a = 0 Add '-21' to each side of the equation. 21 + -21 + -3a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = 0 + -21 -3a = 0 + -21 Combine like terms: 0 + -21 = -21 -3a = -21 Divide each side by '-3'. a = 7 Simplifying a = 7
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