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Simplifying 7a + -1(3a + -9) = 13 Reorder the terms: 7a + -1(-9 + 3a) = 13 7a + (-9 * -1 + 3a * -1) = 13 7a + (9 + -3a) = 13 Reorder the terms: 9 + 7a + -3a = 13 Combine like terms: 7a + -3a = 4a 9 + 4a = 13 Solving 9 + 4a = 13 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 + 4a = 13 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = 13 + -9 4a = 13 + -9 Combine like terms: 13 + -9 = 4 4a = 4 Divide each side by '4'. a = 1 Simplifying a = 1
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