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Simplifying -2a + -1(9) = 39 Multiply -1 * 9 -2a + -9 = 39 Reorder the terms: -9 + -2a = 39 Solving -9 + -2a = 39 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 = 39 + 9 Combine like terms: -9 + 9 = 0 0 + -2a = 39 + 9 -2a = 39 + 9 Combine like terms: 39 + 9 = 48 -2a = 48 Divide each side by '-2'. a = -24 Simplifying a = -24
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