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