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Simplifying 9 = 4a + 13 + -1 Reorder the terms: 9 = 13 + -1 + 4a Combine like terms: 13 + -1 = 12 9 = 12 + 4a Solving 9 = 12 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 9 + -4a = 12 + 4a + -4a Combine like terms: 4a + -4a = 0 9 + -4a = 12 + 0 9 + -4a = 12 Add '-9' to each side of the equation. 9 + -9 + -4a = 12 + -9 Combine like terms: 9 + -9 = 0 0 + -4a = 12 + -9 -4a = 12 + -9 Combine like terms: 12 + -9 = 3 -4a = 3 Divide each side by '-4'. a = -0.75 Simplifying a = -0.75
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