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Simplifying 21 + -5a = 5 + -6a Solving 21 + -5a = 5 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. 21 + -5a + 6a = 5 + -6a + 6a Combine like terms: -5a + 6a = 1a 21 + 1a = 5 + -6a + 6a Combine like terms: -6a + 6a = 0 21 + 1a = 5 + 0 21 + 1a = 5 Add '-21' to each side of the equation. 21 + -21 + 1a = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 1a = 5 + -21 1a = 5 + -21 Combine like terms: 5 + -21 = -16 1a = -16 Divide each side by '1'. a = -16 Simplifying a = -16
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