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Simplifying -13 = -5a + 7 Reorder the terms: -13 = 7 + -5a Solving -13 = 7 + -5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5a' to each side of the equation. -13 + 5a = 7 + -5a + 5a Combine like terms: -5a + 5a = 0 -13 + 5a = 7 + 0 -13 + 5a = 7 Add '13' to each side of the equation. -13 + 13 + 5a = 7 + 13 Combine like terms: -13 + 13 = 0 0 + 5a = 7 + 13 5a = 7 + 13 Combine like terms: 7 + 13 = 20 5a = 20 Divide each side by '5'. a = 4 Simplifying a = 4
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