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Simplifying 8a + -2a + 12 = 42 Reorder the terms: 12 + 8a + -2a = 42 Combine like terms: 8a + -2a = 6a 12 + 6a = 42 Solving 12 + 6a = 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 + 6a = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 6a = 42 + -12 6a = 42 + -12 Combine like terms: 42 + -12 = 30 6a = 30 Divide each side by '6'. a = 5 Simplifying a = 5
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