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Simplifying 12a + 75a + 21 = 630 Reorder the terms: 21 + 12a + 75a = 630 Combine like terms: 12a + 75a = 87a 21 + 87a = 630 Solving 21 + 87a = 630 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 + 87a = 630 + -21 Combine like terms: 21 + -21 = 0 0 + 87a = 630 + -21 87a = 630 + -21 Combine like terms: 630 + -21 = 609 87a = 609 Divide each side by '87'. a = 7 Simplifying a = 7
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