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Simplifying 13(a + -9) = -7 + -6 Reorder the terms: 13(-9 + a) = -7 + -6 (-9 * 13 + a * 13) = -7 + -6 (-117 + 13a) = -7 + -6 Combine like terms: -7 + -6 = -13 -117 + 13a = -13 Solving -117 + 13a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '117' to each side of the equation. -117 + 117 + 13a = -13 + 117 Combine like terms: -117 + 117 = 0 0 + 13a = -13 + 117 13a = -13 + 117 Combine like terms: -13 + 117 = 104 13a = 104 Divide each side by '13'. a = 8 Simplifying a = 8
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