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Simplifying -13 = -7a + 1 Reorder the terms: -13 = 1 + -7a Solving -13 = 1 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. -13 + 7a = 1 + -7a + 7a Combine like terms: -7a + 7a = 0 -13 + 7a = 1 + 0 -13 + 7a = 1 Add '13' to each side of the equation. -13 + 13 + 7a = 1 + 13 Combine like terms: -13 + 13 = 0 0 + 7a = 1 + 13 7a = 1 + 13 Combine like terms: 1 + 13 = 14 7a = 14 Divide each side by '7'. a = 2 Simplifying a = 2
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