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Simplifying [a + -5] + -3 = 12 Reorder the terms: [-5 + a] + -3 = 12 Remove brackets around [-5 + a] -5 + a + -3 = 12 Reorder the terms: -5 + -3 + a = 12 Combine like terms: -5 + -3 = -8 -8 + a = 12 Solving -8 + a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = 12 + 8 Combine like terms: -8 + 8 = 0 0 + a = 12 + 8 a = 12 + 8 Combine like terms: 12 + 8 = 20 a = 20 Simplifying a = 20
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