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Simplifying 1 + a * -9 + -4 = 0 Reorder the terms for easier multiplication: 1 + -9a + -4 = 0 Reorder the terms: 1 + -4 + -9a = 0 Combine like terms: 1 + -4 = -3 -3 + -9a = 0 Solving -3 + -9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -9a = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -9a = 0 + 3 -9a = 0 + 3 Combine like terms: 0 + 3 = 3 -9a = 3 Divide each side by '-9'. a = -0.3333333333 Simplifying a = -0.3333333333
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