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Simplifying -8a + -7(a + 2) = -89 Reorder the terms: -8a + -7(2 + a) = -89 -8a + (2 * -7 + a * -7) = -89 -8a + (-14 + -7a) = -89 Reorder the terms: -14 + -8a + -7a = -89 Combine like terms: -8a + -7a = -15a -14 + -15a = -89 Solving -14 + -15a = -89 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + -15a = -89 + 14 Combine like terms: -14 + 14 = 0 0 + -15a = -89 + 14 -15a = -89 + 14 Combine like terms: -89 + 14 = -75 -15a = -75 Divide each side by '-15'. a = 5 Simplifying a = 5
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