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Simplifying -21 = 9a + -15 + -3a Reorder the terms: -21 = -15 + 9a + -3a Combine like terms: 9a + -3a = 6a -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 = 6 -6a = 6 Divide each side by '-6'. a = -1 Simplifying a = -1
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