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Simplifying 3 + -3(a + 2) = 9 + a Reorder the terms: 3 + -3(2 + a) = 9 + a 3 + (2 * -3 + a * -3) = 9 + a 3 + (-6 + -3a) = 9 + a Combine like terms: 3 + -6 = -3 -3 + -3a = 9 + a Solving -3 + -3a = 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. -3 + -3a + -1a = 9 + a + -1a Combine like terms: -3a + -1a = -4a -3 + -4a = 9 + a + -1a Combine like terms: a + -1a = 0 -3 + -4a = 9 + 0 -3 + -4a = 9 Add '3' to each side of the equation. -3 + 3 + -4a = 9 + 3 Combine like terms: -3 + 3 = 0 0 + -4a = 9 + 3 -4a = 9 + 3 Combine like terms: 9 + 3 = 12 -4a = 12 Divide each side by '-4'. a = -3 Simplifying a = -3
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