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Simplifying 4 + -5 = a + -13 Combine like terms: 4 + -5 = -1 -1 = a + -13 Reorder the terms: -1 = -13 + a Solving -1 = -13 + 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. -1 + -1a = -13 + a + -1a Combine like terms: a + -1a = 0 -1 + -1a = -13 + 0 -1 + -1a = -13 Add '1' to each side of the equation. -1 + 1 + -1a = -13 + 1 Combine like terms: -1 + 1 = 0 0 + -1a = -13 + 1 -1a = -13 + 1 Combine like terms: -13 + 1 = -12 -1a = -12 Divide each side by '-1'. a = 12 Simplifying a = 12
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