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Simplifying a + (2a + 8) = 21 Reorder the terms: a + (8 + 2a) = 21 Remove parenthesis around (8 + 2a) a + 8 + 2a = 21 Reorder the terms: 8 + a + 2a = 21 Combine like terms: a + 2a = 3a 8 + 3a = 21 Solving 8 + 3a = 21 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 + 3a = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 3a = 21 + -8 3a = 21 + -8 Combine like terms: 21 + -8 = 13 3a = 13 Divide each side by '3'. a = 4.333333333 Simplifying a = 4.333333333
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