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Simplifying 3a + -1(9 + -7a) = 34 3a + (9 * -1 + -7a * -1) = 34 3a + (-9 + 7a) = 34 Reorder the terms: -9 + 3a + 7a = 34 Combine like terms: 3a + 7a = 10a -9 + 10a = 34 Solving -9 + 10a = 34 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 10a = 34 + 9 Combine like terms: -9 + 9 = 0 0 + 10a = 34 + 9 10a = 34 + 9 Combine like terms: 34 + 9 = 43 10a = 43 Divide each side by '10'. a = 4.3 Simplifying a = 4.3
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