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Simplifying 3a + -7(1 + -1a) = 8 3a + (1 * -7 + -1a * -7) = 8 3a + (-7 + 7a) = 8 Reorder the terms: -7 + 3a + 7a = 8 Combine like terms: 3a + 7a = 10a -7 + 10a = 8 Solving -7 + 10a = 8 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 + 10a = 8 + 7 Combine like terms: -7 + 7 = 0 0 + 10a = 8 + 7 10a = 8 + 7 Combine like terms: 8 + 7 = 15 10a = 15 Divide each side by '10'. a = 1.5 Simplifying a = 1.5
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