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Simplifying -1(a + 5) + -7 = a Reorder the terms: -1(5 + a) + -7 = a (5 * -1 + a * -1) + -7 = a (-5 + -1a) + -7 = a Reorder the terms: -5 + -7 + -1a = a Combine like terms: -5 + -7 = -12 -12 + -1a = a Solving -12 + -1a = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -12 + -1a + -1a = a + -1a Combine like terms: -1a + -1a = -2a -12 + -2a = a + -1a Combine like terms: a + -1a = 0 -12 + -2a = 0 Add '12' to each side of the equation. -12 + 12 + -2a = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -2a = 0 + 12 -2a = 0 + 12 Combine like terms: 0 + 12 = 12 -2a = 12 Divide each side by '-2'. a = -6 Simplifying a = -6
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