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Simplifying 21 = 2a + (5 + a) + a Remove parenthesis around (5 + a) 21 = 2a + 5 + a + a Reorder the terms: 21 = 5 + 2a + a + a Combine like terms: 2a + a = 3a 21 = 5 + 3a + a Combine like terms: 3a + a = 4a 21 = 5 + 4a Solving 21 = 5 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 21 + -4a = 5 + 4a + -4a Combine like terms: 4a + -4a = 0 21 + -4a = 5 + 0 21 + -4a = 5 Add '-21' to each side of the equation. 21 + -21 + -4a = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -4a = 5 + -21 -4a = 5 + -21 Combine like terms: 5 + -21 = -16 -4a = -16 Divide each side by '-4'. a = 4 Simplifying a = 4
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