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Simplifying -5a + -2(-7a + -10) = 128 Reorder the terms: -5a + -2(-10 + -7a) = 128 -5a + (-10 * -2 + -7a * -2) = 128 -5a + (20 + 14a) = 128 Reorder the terms: 20 + -5a + 14a = 128 Combine like terms: -5a + 14a = 9a 20 + 9a = 128 Solving 20 + 9a = 128 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 9a = 128 + -20 Combine like terms: 20 + -20 = 0 0 + 9a = 128 + -20 9a = 128 + -20 Combine like terms: 128 + -20 = 108 9a = 108 Divide each side by '9'. a = 12 Simplifying a = 12
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