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Simplifying 7a + -1(2a + -7) = 13 Reorder the terms: 7a + -1(-7 + 2a) = 13 7a + (-7 * -1 + 2a * -1) = 13 7a + (7 + -2a) = 13 Reorder the terms: 7 + 7a + -2a = 13 Combine like terms: 7a + -2a = 5a 7 + 5a = 13 Solving 7 + 5a = 13 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 + 5a = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 5a = 13 + -7 5a = 13 + -7 Combine like terms: 13 + -7 = 6 5a = 6 Divide each side by '5'. a = 1.2 Simplifying a = 1.2
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