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Simplifying 2a + 3 + -6 = -21 Reorder the terms: 3 + -6 + 2a = -21 Combine like terms: 3 + -6 = -3 -3 + 2a = -21 Solving -3 + 2a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2a = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = -21 + 3 2a = -21 + 3 Combine like terms: -21 + 3 = -18 2a = -18 Divide each side by '2'. a = -9 Simplifying a = -9
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