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Simplifying 23(a + -21) = 207 Reorder the terms: 23(-21 + a) = 207 (-21 * 23 + a * 23) = 207 (-483 + 23a) = 207 Solving -483 + 23a = 207 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '483' to each side of the equation. -483 + 483 + 23a = 207 + 483 Combine like terms: -483 + 483 = 0 0 + 23a = 207 + 483 23a = 207 + 483 Combine like terms: 207 + 483 = 690 23a = 690 Divide each side by '23'. a = 30 Simplifying a = 30
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