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Simplifying 42 = 18 + -8a Solving 42 = 18 + -8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8a' to each side of the equation. 42 + 8a = 18 + -8a + 8a Combine like terms: -8a + 8a = 0 42 + 8a = 18 + 0 42 + 8a = 18 Add '-42' to each side of the equation. 42 + -42 + 8a = 18 + -42 Combine like terms: 42 + -42 = 0 0 + 8a = 18 + -42 8a = 18 + -42 Combine like terms: 18 + -42 = -24 8a = -24 Divide each side by '8'. a = -3 Simplifying a = -3
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