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Simplifying 3a + -7(3 + -1a) = 15 3a + (3 * -7 + -1a * -7) = 15 3a + (-21 + 7a) = 15 Reorder the terms: -21 + 3a + 7a = 15 Combine like terms: 3a + 7a = 10a -21 + 10a = 15 Solving -21 + 10a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10a = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 10a = 15 + 21 10a = 15 + 21 Combine like terms: 15 + 21 = 36 10a = 36 Divide each side by '10'. a = 3.6 Simplifying a = 3.6
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