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Simplifying -7(9a + -4) = 31 Reorder the terms: -7(-4 + 9a) = 31 (-4 * -7 + 9a * -7) = 31 (28 + -63a) = 31 Solving 28 + -63a = 31 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -63a = 31 + -28 Combine like terms: 28 + -28 = 0 0 + -63a = 31 + -28 -63a = 31 + -28 Combine like terms: 31 + -28 = 3 -63a = 3 Divide each side by '-63'. a = -0.04761904762 Simplifying a = -0.04761904762
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