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