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Simplifying -21 = -9a + -15 + -3a Reorder the terms: -21 = -15 + -9a + -3a Combine like terms: -9a + -3a = -12a -21 = -15 + -12a Solving -21 = -15 + -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. -21 + 12a = -15 + -12a + 12a Combine like terms: -12a + 12a = 0 -21 + 12a = -15 + 0 -21 + 12a = -15 Add '21' to each side of the equation. -21 + 21 + 12a = -15 + 21 Combine like terms: -21 + 21 = 0 0 + 12a = -15 + 21 12a = -15 + 21 Combine like terms: -15 + 21 = 6 12a = 6 Divide each side by '12'. a = 0.5 Simplifying a = 0.5
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