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Simplifying 3a + (2a + -5) = 13 Reorder the terms: 3a + (-5 + 2a) = 13 Remove parenthesis around (-5 + 2a) 3a + -5 + 2a = 13 Reorder the terms: -5 + 3a + 2a = 13 Combine like terms: 3a + 2a = 5a -5 + 5a = 13 Solving -5 + 5a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 5a = 13 + 5 Combine like terms: -5 + 5 = 0 0 + 5a = 13 + 5 5a = 13 + 5 Combine like terms: 13 + 5 = 18 5a = 18 Divide each side by '5'. a = 3.6 Simplifying a = 3.6
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