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Simplifying 3 + (9 + A) = 3A Remove parenthesis around (9 + A) 3 + 9 + A = 3A Combine like terms: 3 + 9 = 12 12 + A = 3A Solving 12 + A = 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. 12 + A + -3A = 3A + -3A Combine like terms: A + -3A = -2A 12 + -2A = 3A + -3A Combine like terms: 3A + -3A = 0 12 + -2A = 0 Add '-12' to each side of the equation. 12 + -12 + -2A = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -2A = 0 + -12 -2A = 0 + -12 Combine like terms: 0 + -12 = -12 -2A = -12 Divide each side by '-2'. A = 6 Simplifying A = 6
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