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Simplifying 7 + -8(a + 2) = 9 + a Reorder the terms: 7 + -8(2 + a) = 9 + a 7 + (2 * -8 + a * -8) = 9 + a 7 + (-16 + -8a) = 9 + a Combine like terms: 7 + -16 = -9 -9 + -8a = 9 + a Solving -9 + -8a = 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. -9 + -8a + -1a = 9 + a + -1a Combine like terms: -8a + -1a = -9a -9 + -9a = 9 + a + -1a Combine like terms: a + -1a = 0 -9 + -9a = 9 + 0 -9 + -9a = 9 Add '9' to each side of the equation. -9 + 9 + -9a = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -9a = 9 + 9 -9a = 9 + 9 Combine like terms: 9 + 9 = 18 -9a = 18 Divide each side by '-9'. a = -2 Simplifying a = -2
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