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Simplifying 13 + 2(a + -3) = -9 Reorder the terms: 13 + 2(-3 + a) = -9 13 + (-3 * 2 + a * 2) = -9 13 + (-6 + 2a) = -9 Combine like terms: 13 + -6 = 7 7 + 2a = -9 Solving 7 + 2a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2a = -9 + -7 Combine like terms: 7 + -7 = 0 0 + 2a = -9 + -7 2a = -9 + -7 Combine like terms: -9 + -7 = -16 2a = -16 Divide each side by '2'. a = -8 Simplifying a = -8
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