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Simplifying 13 = -7a + -6a Combine like terms: -7a + -6a = -13a 13 = -13a Solving 13 = -13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '13a' to each side of the equation. 13 + 13a = -13a + 13a Combine like terms: -13a + 13a = 0 13 + 13a = 0 Add '-13' to each side of the equation. 13 + -13 + 13a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 13a = 0 + -13 13a = 0 + -13 Combine like terms: 0 + -13 = -13 13a = -13 Divide each side by '13'. a = -1 Simplifying a = -1
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