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Simplifying -13 = a + 7 Reorder the terms: -13 = 7 + a Solving -13 = 7 + 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. -13 + -1a = 7 + a + -1a Combine like terms: a + -1a = 0 -13 + -1a = 7 + 0 -13 + -1a = 7 Add '13' to each side of the equation. -13 + 13 + -1a = 7 + 13 Combine like terms: -13 + 13 = 0 0 + -1a = 7 + 13 -1a = 7 + 13 Combine like terms: 7 + 13 = 20 -1a = 20 Divide each side by '-1'. a = -20 Simplifying a = -20
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