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Simplifying 2a + -8 + 5a = 20 Reorder the terms: -8 + 2a + 5a = 20 Combine like terms: 2a + 5a = 7a -8 + 7a = 20 Solving -8 + 7a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 7a = 20 + 8 Combine like terms: -8 + 8 = 0 0 + 7a = 20 + 8 7a = 20 + 8 Combine like terms: 20 + 8 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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