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Simplifying -1(6a + 9) + -4(a + -7) = 0 Reorder the terms: -1(9 + 6a) + -4(a + -7) = 0 (9 * -1 + 6a * -1) + -4(a + -7) = 0 (-9 + -6a) + -4(a + -7) = 0 Reorder the terms: -9 + -6a + -4(-7 + a) = 0 -9 + -6a + (-7 * -4 + a * -4) = 0 -9 + -6a + (28 + -4a) = 0 Reorder the terms: -9 + 28 + -6a + -4a = 0 Combine like terms: -9 + 28 = 19 19 + -6a + -4a = 0 Combine like terms: -6a + -4a = -10a 19 + -10a = 0 Solving 19 + -10a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + -10a = 0 + -19 Combine like terms: 19 + -19 = 0 0 + -10a = 0 + -19 -10a = 0 + -19 Combine like terms: 0 + -19 = -19 -10a = -19 Divide each side by '-10'. a = 1.9 Simplifying a = 1.9
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