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Simplifying 2 + -4(a + 2) = 9 + a Reorder the terms: 2 + -4(2 + a) = 9 + a 2 + (2 * -4 + a * -4) = 9 + a 2 + (-8 + -4a) = 9 + a Combine like terms: 2 + -8 = -6 -6 + -4a = 9 + a Solving -6 + -4a = 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. -6 + -4a + -1a = 9 + a + -1a Combine like terms: -4a + -1a = -5a -6 + -5a = 9 + a + -1a Combine like terms: a + -1a = 0 -6 + -5a = 9 + 0 -6 + -5a = 9 Add '6' to each side of the equation. -6 + 6 + -5a = 9 + 6 Combine like terms: -6 + 6 = 0 0 + -5a = 9 + 6 -5a = 9 + 6 Combine like terms: 9 + 6 = 15 -5a = 15 Divide each side by '-5'. a = -3 Simplifying a = -3
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