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Simplifying 21 + -2a = -4(8A + 9) Reorder the terms: 21 + -2a = -4(9 + 8A) 21 + -2a = (9 * -4 + 8A * -4) 21 + -2a = (-36 + -32A) Solving 21 + -2a = -36 + -32A 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 = -36 + -21 + -32A Combine like terms: 21 + -21 = 0 0 + -2a = -36 + -21 + -32A -2a = -36 + -21 + -32A Combine like terms: -36 + -21 = -57 -2a = -57 + -32A Divide each side by '-2'. a = 28.5 + 16A Simplifying a = 28.5 + 16A
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