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Simplifying -1(a + 9) = 4(3 + -6) Reorder the terms: -1(9 + a) = 4(3 + -6) (9 * -1 + a * -1) = 4(3 + -6) (-9 + -1a) = 4(3 + -6) Combine like terms: 3 + -6 = -3 -9 + -1a = 4(-3) Multiply 4 * -3 -9 + -1a = -12 Solving -9 + -1a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1a = -12 + 9 Combine like terms: -9 + 9 = 0 0 + -1a = -12 + 9 -1a = -12 + 9 Combine like terms: -12 + 9 = -3 -1a = -3 Divide each side by '-1'. a = 3 Simplifying a = 3
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