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Simplifying 7a + 4 + -5a = 13 Reorder the terms: 4 + 7a + -5a = 13 Combine like terms: 7a + -5a = 2a 4 + 2a = 13 Solving 4 + 2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2a = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 2a = 13 + -4 2a = 13 + -4 Combine like terms: 13 + -4 = 9 2a = 9 Divide each side by '2'. a = 4.5 Simplifying a = 4.5
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