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Simplifying 12a + 21 = 75 Reorder the terms: 21 + 12a = 75 Solving 21 + 12a = 75 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 + 12a = 75 + -21 Combine like terms: 21 + -21 = 0 0 + 12a = 75 + -21 12a = 75 + -21 Combine like terms: 75 + -21 = 54 12a = 54 Divide each side by '12'. a = 4.5 Simplifying a = 4.5
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