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Simplifying 2a + 6a + -21 = 20 Reorder the terms: -21 + 2a + 6a = 20 Combine like terms: 2a + 6a = 8a -21 + 8a = 20 Solving -21 + 8a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 8a = 20 + 21 Combine like terms: -21 + 21 = 0 0 + 8a = 20 + 21 8a = 20 + 21 Combine like terms: 20 + 21 = 41 8a = 41 Divide each side by '8'. a = 5.125 Simplifying a = 5.125
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