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Simplifying -3 = 42 + -1a Solving -3 = 42 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. -3 + a = 42 + -1a + a Combine like terms: -1a + a = 0 -3 + a = 42 + 0 -3 + a = 42 Add '3' to each side of the equation. -3 + 3 + a = 42 + 3 Combine like terms: -3 + 3 = 0 0 + a = 42 + 3 a = 42 + 3 Combine like terms: 42 + 3 = 45 a = 45 Simplifying a = 45
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