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Simplifying 21(A + -19) = 189 Reorder the terms: 21(-19 + A) = 189 (-19 * 21 + A * 21) = 189 (-399 + 21A) = 189 Solving -399 + 21A = 189 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '399' to each side of the equation. -399 + 399 + 21A = 189 + 399 Combine like terms: -399 + 399 = 0 0 + 21A = 189 + 399 21A = 189 + 399 Combine like terms: 189 + 399 = 588 21A = 588 Divide each side by '21'. A = 28 Simplifying A = 28
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