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Simplifying a + -13 = 7 Reorder the terms: -13 + a = 7 Solving -13 + a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + a = 7 + 13 Combine like terms: -13 + 13 = 0 0 + a = 7 + 13 a = 7 + 13 Combine like terms: 7 + 13 = 20 a = 20 Simplifying a = 20
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