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Simplifying 42 = 2a + 18 Reorder the terms: 42 = 18 + 2a Solving 42 = 18 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 42 + -2a = 18 + 2a + -2a Combine like terms: 2a + -2a = 0 42 + -2a = 18 + 0 42 + -2a = 18 Add '-42' to each side of the equation. 42 + -42 + -2a = 18 + -42 Combine like terms: 42 + -42 = 0 0 + -2a = 18 + -42 -2a = 18 + -42 Combine like terms: 18 + -42 = -24 -2a = -24 Divide each side by '-2'. a = 12 Simplifying a = 12
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