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Simplifying 13 + 7a + -1a = -3 + 8a Combine like terms: 7a + -1a = 6a 13 + 6a = -3 + 8a Solving 13 + 6a = -3 + 8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8a' to each side of the equation. 13 + 6a + -8a = -3 + 8a + -8a Combine like terms: 6a + -8a = -2a 13 + -2a = -3 + 8a + -8a Combine like terms: 8a + -8a = 0 13 + -2a = -3 + 0 13 + -2a = -3 Add '-13' to each side of the equation. 13 + -13 + -2a = -3 + -13 Combine like terms: 13 + -13 = 0 0 + -2a = -3 + -13 -2a = -3 + -13 Combine like terms: -3 + -13 = -16 -2a = -16 Divide each side by '-2'. a = 8 Simplifying a = 8
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