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Simplifying 8a + -3(2a + 15) = 13 Reorder the terms: 8a + -3(15 + 2a) = 13 8a + (15 * -3 + 2a * -3) = 13 8a + (-45 + -6a) = 13 Reorder the terms: -45 + 8a + -6a = 13 Combine like terms: 8a + -6a = 2a -45 + 2a = 13 Solving -45 + 2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 2a = 13 + 45 Combine like terms: -45 + 45 = 0 0 + 2a = 13 + 45 2a = 13 + 45 Combine like terms: 13 + 45 = 58 2a = 58 Divide each side by '2'. a = 29 Simplifying a = 29
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