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Simplifying 5a + -6 + -1(a + 7) = 0 Reorder the terms: 5a + -6 + -1(7 + a) = 0 5a + -6 + (7 * -1 + a * -1) = 0 5a + -6 + (-7 + -1a) = 0 Reorder the terms: -6 + -7 + 5a + -1a = 0 Combine like terms: -6 + -7 = -13 -13 + 5a + -1a = 0 Combine like terms: 5a + -1a = 4a -13 + 4a = 0 Solving -13 + 4a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 4a = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 4a = 0 + 13 4a = 0 + 13 Combine like terms: 0 + 13 = 13 4a = 13 Divide each side by '4'. a = 3.25 Simplifying a = 3.25
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