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Simplifying a + (-7) = 8 a + -7 = 8 Reorder the terms: -7 + a = 8 Solving -7 + a = 8 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + a = 8 + 7 Combine like terms: -7 + 7 = 0 0 + a = 8 + 7 a = 8 + 7 Combine like terms: 8 + 7 = 15 a = 15 Simplifying a = 15
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