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Simplifying -6a + -4(2a + 7) + -1a = 0 Reorder the terms: -6a + -4(7 + 2a) + -1a = 0 -6a + (7 * -4 + 2a * -4) + -1a = 0 -6a + (-28 + -8a) + -1a = 0 Reorder the terms: -28 + -6a + -8a + -1a = 0 Combine like terms: -6a + -8a = -14a -28 + -14a + -1a = 0 Combine like terms: -14a + -1a = -15a -28 + -15a = 0 Solving -28 + -15a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -15a = 0 + 28 Combine like terms: -28 + 28 = 0 0 + -15a = 0 + 28 -15a = 0 + 28 Combine like terms: 0 + 28 = 28 -15a = 28 Divide each side by '-15'. a = -1.866666667 Simplifying a = -1.866666667
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