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Simplifying -7(9a + 3) = 31 Reorder the terms: -7(3 + 9a) = 31 (3 * -7 + 9a * -7) = 31 (-21 + -63a) = 31 Solving -21 + -63a = 31 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 + -63a = 31 + 21 Combine like terms: -21 + 21 = 0 0 + -63a = 31 + 21 -63a = 31 + 21 Combine like terms: 31 + 21 = 52 -63a = 52 Divide each side by '-63'. a = -0.8253968254 Simplifying a = -0.8253968254
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