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Simplifying -21 = 15 + -6a Solving -21 = 15 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. -21 + 6a = 15 + -6a + 6a Combine like terms: -6a + 6a = 0 -21 + 6a = 15 + 0 -21 + 6a = 15 Add '21' to each side of the equation. -21 + 21 + 6a = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 6a = 15 + 21 6a = 15 + 21 Combine like terms: 15 + 21 = 36 6a = 36 Divide each side by '6'. a = 6 Simplifying a = 6
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