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Simplifying 9a + -12 = 42 Reorder the terms: -12 + 9a = 42 Solving -12 + 9a = 42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 9a = 42 + 12 Combine like terms: -12 + 12 = 0 0 + 9a = 42 + 12 9a = 42 + 12 Combine like terms: 42 + 12 = 54 9a = 54 Divide each side by '9'. a = 6 Simplifying a = 6
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