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Simplifying 2a + 3a + -6 = 21 Reorder the terms: -6 + 2a + 3a = 21 Combine like terms: 2a + 3a = 5a -6 + 5a = 21 Solving -6 + 5a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 5a = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 5a = 21 + 6 5a = 21 + 6 Combine like terms: 21 + 6 = 27 5a = 27 Divide each side by '5'. a = 5.4 Simplifying a = 5.4
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