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Simplifying 7a + -1(-13) = 0 Multiply -1 * -13 7a + 13 = 0 Reorder the terms: 13 + 7a = 0 Solving 13 + 7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 7a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 7a = 0 + -13 7a = 0 + -13 Combine like terms: 0 + -13 = -13 7a = -13 Divide each side by '7'. a = -1.857142857 Simplifying a = -1.857142857
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