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Simplifying a + 8 + -8a = -13 Reorder the terms: 8 + a + -8a = -13 Combine like terms: a + -8a = -7a 8 + -7a = -13 Solving 8 + -7a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7a = -13 + -8 Combine like terms: 8 + -8 = 0 0 + -7a = -13 + -8 -7a = -13 + -8 Combine like terms: -13 + -8 = -21 -7a = -21 Divide each side by '-7'. a = 3 Simplifying a = 3
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