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Simplifying -9 = -7a + -1(8a + 3) Reorder the terms: -9 = -7a + -1(3 + 8a) -9 = -7a + (3 * -1 + 8a * -1) -9 = -7a + (-3 + -8a) Reorder the terms: -9 = -3 + -7a + -8a Combine like terms: -7a + -8a = -15a -9 = -3 + -15a Solving -9 = -3 + -15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15a' to each side of the equation. -9 + 15a = -3 + -15a + 15a Combine like terms: -15a + 15a = 0 -9 + 15a = -3 + 0 -9 + 15a = -3 Add '9' to each side of the equation. -9 + 9 + 15a = -3 + 9 Combine like terms: -9 + 9 = 0 0 + 15a = -3 + 9 15a = -3 + 9 Combine like terms: -3 + 9 = 6 15a = 6 Divide each side by '15'. a = 0.4 Simplifying a = 0.4
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