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Simplifying a + (a + 21) = 151 Reorder the terms: a + (21 + a) = 151 Remove parenthesis around (21 + a) a + 21 + a = 151 Reorder the terms: 21 + a + a = 151 Combine like terms: a + a = 2a 21 + 2a = 151 Solving 21 + 2a = 151 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 + 2a = 151 + -21 Combine like terms: 21 + -21 = 0 0 + 2a = 151 + -21 2a = 151 + -21 Combine like terms: 151 + -21 = 130 2a = 130 Divide each side by '2'. a = 65 Simplifying a = 65
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