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Simplifying -4a + 3(2a + -5) = 31 Reorder the terms: -4a + 3(-5 + 2a) = 31 -4a + (-5 * 3 + 2a * 3) = 31 -4a + (-15 + 6a) = 31 Reorder the terms: -15 + -4a + 6a = 31 Combine like terms: -4a + 6a = 2a -15 + 2a = 31 Solving -15 + 2a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 2a = 31 + 15 Combine like terms: -15 + 15 = 0 0 + 2a = 31 + 15 2a = 31 + 15 Combine like terms: 31 + 15 = 46 2a = 46 Divide each side by '2'. a = 23 Simplifying a = 23
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