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Simplifying -2a + -9 = 6 + 15 Reorder the terms: -9 + -2a = 6 + 15 Combine like terms: 6 + 15 = 21 -9 + -2a = 21 Solving -9 + -2a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -2a = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -2a = 21 + 9 -2a = 21 + 9 Combine like terms: 21 + 9 = 30 -2a = 30 Divide each side by '-2'. a = -15 Simplifying a = -15
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