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Simplifying -8a + -1(-7) = (-9) Multiply -1 * -7 -8a + 7 = (-9) Reorder the terms: 7 + -8a = (-9) 7 + -8a = -9 Solving 7 + -8a = -9 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 + -8a = -9 + -7 Combine like terms: 7 + -7 = 0 0 + -8a = -9 + -7 -8a = -9 + -7 Combine like terms: -9 + -7 = -16 -8a = -16 Divide each side by '-8'. a = 2 Simplifying a = 2
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