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Simplifying -6a + -4(2a + 7) + -7a = 0 Reorder the terms: -6a + -4(7 + 2a) + -7a = 0 -6a + (7 * -4 + 2a * -4) + -7a = 0 -6a + (-28 + -8a) + -7a = 0 Reorder the terms: -28 + -6a + -8a + -7a = 0 Combine like terms: -6a + -8a = -14a -28 + -14a + -7a = 0 Combine like terms: -14a + -7a = -21a -28 + -21a = 0 Solving -28 + -21a = 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 + -21a = 0 + 28 Combine like terms: -28 + 28 = 0 0 + -21a = 0 + 28 -21a = 0 + 28 Combine like terms: 0 + 28 = 28 -21a = 28 Divide each side by '-21'. a = -1.333333333 Simplifying a = -1.333333333
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