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Simplifying 4a + 9 + -6a = -42 Reorder the terms: 9 + 4a + -6a = -42 Combine like terms: 4a + -6a = -2a 9 + -2a = -42 Solving 9 + -2a = -42 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 + -2a = -42 + -9 Combine like terms: 9 + -9 = 0 0 + -2a = -42 + -9 -2a = -42 + -9 Combine like terms: -42 + -9 = -51 -2a = -51 Divide each side by '-2'. a = 25.5 Simplifying a = 25.5
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