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Simplifying a + (a + -9) = (a + -7) + -1(a + 2) Reorder the terms: a + (-9 + a) = (a + -7) + -1(a + 2) Remove parenthesis around (-9 + a) a + -9 + a = (a + -7) + -1(a + 2) Reorder the terms: -9 + a + a = (a + -7) + -1(a + 2) Combine like terms: a + a = 2a -9 + 2a = (a + -7) + -1(a + 2) Reorder the terms: -9 + 2a = (-7 + a) + -1(a + 2) Remove parenthesis around (-7 + a) -9 + 2a = -7 + a + -1(a + 2) Reorder the terms: -9 + 2a = -7 + a + -1(2 + a) -9 + 2a = -7 + a + (2 * -1 + a * -1) -9 + 2a = -7 + a + (-2 + -1a) Reorder the terms: -9 + 2a = -7 + -2 + a + -1a Combine like terms: -7 + -2 = -9 -9 + 2a = -9 + a + -1a Combine like terms: a + -1a = 0 -9 + 2a = -9 + 0 -9 + 2a = -9 Add '9' to each side of the equation. -9 + 9 + 2a = -9 + 9 Combine like terms: -9 + 9 = 0 0 + 2a = -9 + 9 2a = -9 + 9 Combine like terms: -9 + 9 = 0 2a = 0 Solving 2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '2'. a = 0 Simplifying a = 0
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