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Simplifying 15 + -1(-8a) = -25 Remove parenthesis around (-8a) 15 + -1 * -8a = -25 Multiply -1 * -8 15 + 8a = -25 Solving 15 + 8a = -25 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 8a = -25 + -15 Combine like terms: 15 + -15 = 0 0 + 8a = -25 + -15 8a = -25 + -15 Combine like terms: -25 + -15 = -40 8a = -40 Divide each side by '8'. a = -5 Simplifying a = -5
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