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Simplifying 13(a + -7) = -7 + -6 Reorder the terms: 13(-7 + a) = -7 + -6 (-7 * 13 + a * 13) = -7 + -6 (-91 + 13a) = -7 + -6 Combine like terms: -7 + -6 = -13 -91 + 13a = -13 Solving -91 + 13a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '91' to each side of the equation. -91 + 91 + 13a = -13 + 91 Combine like terms: -91 + 91 = 0 0 + 13a = -13 + 91 13a = -13 + 91 Combine like terms: -13 + 91 = 78 13a = 78 Divide each side by '13'. a = 6 Simplifying a = 6
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