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Simplifying 13 + 4a = 9a + -2 Reorder the terms: 13 + 4a = -2 + 9a Solving 13 + 4a = -2 + 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. 13 + 4a + -9a = -2 + 9a + -9a Combine like terms: 4a + -9a = -5a 13 + -5a = -2 + 9a + -9a Combine like terms: 9a + -9a = 0 13 + -5a = -2 + 0 13 + -5a = -2 Add '-13' to each side of the equation. 13 + -13 + -5a = -2 + -13 Combine like terms: 13 + -13 = 0 0 + -5a = -2 + -13 -5a = -2 + -13 Combine like terms: -2 + -13 = -15 -5a = -15 Divide each side by '-5'. a = 3 Simplifying a = 3
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