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Simplifying 2a + 21 = 8a + 0 Reorder the terms: 21 + 2a = 8a + 0 Reorder the terms: 21 + 2a = 0 + 8a Remove the zero: 21 + 2a = 8a Solving 21 + 2a = 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 + 2a + -8a = 8a + -8a Combine like terms: 2a + -8a = -6a 21 + -6a = 8a + -8a Combine like terms: 8a + -8a = 0 21 + -6a = 0 Add '-21' to each side of the equation. 21 + -21 + -6a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -6a = 0 + -21 -6a = 0 + -21 Combine like terms: 0 + -21 = -21 -6a = -21 Divide each side by '-6'. a = 3.5 Simplifying a = 3.5
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