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Simplifying 21 = 2a + (5 + a) Remove parenthesis around (5 + a) 21 = 2a + 5 + a Reorder the terms: 21 = 5 + 2a + a Combine like terms: 2a + a = 3a 21 = 5 + 3a Solving 21 = 5 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 21 + -3a = 5 + 3a + -3a Combine like terms: 3a + -3a = 0 21 + -3a = 5 + 0 21 + -3a = 5 Add '-21' to each side of the equation. 21 + -21 + -3a = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = 5 + -21 -3a = 5 + -21 Combine like terms: 5 + -21 = -16 -3a = -16 Divide each side by '-3'. a = 5.333333333 Simplifying a = 5.333333333
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