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Simplifying -7(4a + 7) + 8a = -89 Reorder the terms: -7(7 + 4a) + 8a = -89 (7 * -7 + 4a * -7) + 8a = -89 (-49 + -28a) + 8a = -89 Combine like terms: -28a + 8a = -20a -49 + -20a = -89 Solving -49 + -20a = -89 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + -20a = -89 + 49 Combine like terms: -49 + 49 = 0 0 + -20a = -89 + 49 -20a = -89 + 49 Combine like terms: -89 + 49 = -40 -20a = -40 Divide each side by '-20'. a = 2 Simplifying a = 2
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