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Simplifying -21 = 9a + -15 Reorder the terms: -21 = -15 + 9a Solving -21 = -15 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -21 + -9a = -15 + 9a + -9a Combine like terms: 9a + -9a = 0 -21 + -9a = -15 + 0 -21 + -9a = -15 Add '21' to each side of the equation. -21 + 21 + -9a = -15 + 21 Combine like terms: -21 + 21 = 0 0 + -9a = -15 + 21 -9a = -15 + 21 Combine like terms: -15 + 21 = 6 -9a = 6 Divide each side by '-9'. a = -0.6666666667 Simplifying a = -0.6666666667
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