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Simplifying -3 + 12 + (-13) = a -3 + 12 + -13 = a Combine like terms: -3 + 12 = 9 9 + -13 = a Combine like terms: 9 + -13 = -4 -4 = a Solving -4 = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -4 + -1a = a + -1a Combine like terms: a + -1a = 0 -4 + -1a = 0 Add '4' to each side of the equation. -4 + 4 + -1a = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1a = 0 + 4 -1a = 0 + 4 Combine like terms: 0 + 4 = 4 -1a = 4 Divide each side by '-1'. a = -4 Simplifying a = -4
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