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Simplifying 7 + -7(a + 2) = 9 + a Reorder the terms: 7 + -7(2 + a) = 9 + a 7 + (2 * -7 + a * -7) = 9 + a 7 + (-14 + -7a) = 9 + a Combine like terms: 7 + -14 = -7 -7 + -7a = 9 + a Solving -7 + -7a = 9 + 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. -7 + -7a + -1a = 9 + a + -1a Combine like terms: -7a + -1a = -8a -7 + -8a = 9 + a + -1a Combine like terms: a + -1a = 0 -7 + -8a = 9 + 0 -7 + -8a = 9 Add '7' to each side of the equation. -7 + 7 + -8a = 9 + 7 Combine like terms: -7 + 7 = 0 0 + -8a = 9 + 7 -8a = 9 + 7 Combine like terms: 9 + 7 = 16 -8a = 16 Divide each side by '-8'. a = -2 Simplifying a = -2
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