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Simplifying 3 + 4a = 9a + 13 Reorder the terms: 3 + 4a = 13 + 9a Solving 3 + 4a = 13 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 3 + 4a + -9a = 13 + 9a + -9a Combine like terms: 4a + -9a = -5a 3 + -5a = 13 + 9a + -9a Combine like terms: 9a + -9a = 0 3 + -5a = 13 + 0 3 + -5a = 13 Add '-3' to each side of the equation. 3 + -3 + -5a = 13 + -3 Combine like terms: 3 + -3 = 0 0 + -5a = 13 + -3 -5a = 13 + -3 Combine like terms: 13 + -3 = 10 -5a = 10 Divide each side by '-5'. a = -2 Simplifying a = -2
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