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Simplifying 13 + 13a = -1(-7a + -3) Reorder the terms: 13 + 13a = -1(-3 + -7a) 13 + 13a = (-3 * -1 + -7a * -1) 13 + 13a = (3 + 7a) Solving 13 + 13a = 3 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 13 + 13a + -7a = 3 + 7a + -7a Combine like terms: 13a + -7a = 6a 13 + 6a = 3 + 7a + -7a Combine like terms: 7a + -7a = 0 13 + 6a = 3 + 0 13 + 6a = 3 Add '-13' to each side of the equation. 13 + -13 + 6a = 3 + -13 Combine like terms: 13 + -13 = 0 0 + 6a = 3 + -13 6a = 3 + -13 Combine like terms: 3 + -13 = -10 6a = -10 Divide each side by '6'. a = -1.666666667 Simplifying a = -1.666666667
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