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Simplifying 15 = 12a + -21 Reorder the terms: 15 = -21 + 12a Solving 15 = -21 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. 15 + -12a = -21 + 12a + -12a Combine like terms: 12a + -12a = 0 15 + -12a = -21 + 0 15 + -12a = -21 Add '-15' to each side of the equation. 15 + -15 + -12a = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -12a = -21 + -15 -12a = -21 + -15 Combine like terms: -21 + -15 = -36 -12a = -36 Divide each side by '-12'. a = 3 Simplifying a = 3
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