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Simplifying -7(1 + 9a) = -30.5 (1 * -7 + 9a * -7) = -30.5 (-7 + -63a) = -30.5 Solving -7 + -63a = -30.5 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -63a = -30.5 + 7 Combine like terms: -7 + 7 = 0 0 + -63a = -30.5 + 7 -63a = -30.5 + 7 Combine like terms: -30.5 + 7 = -23.5 -63a = -23.5 Divide each side by '-63'. a = 0.373015873 Simplifying a = 0.373015873
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