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Simplifying -6a + 2 + 7a = 15 + -21 Reorder the terms: 2 + -6a + 7a = 15 + -21 Combine like terms: -6a + 7a = 1a 2 + 1a = 15 + -21 Combine like terms: 15 + -21 = -6 2 + 1a = -6 Solving 2 + 1a = -6 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 1a = -6 + -2 Combine like terms: 2 + -2 = 0 0 + 1a = -6 + -2 1a = -6 + -2 Combine like terms: -6 + -2 = -8 1a = -8 Divide each side by '1'. a = -8 Simplifying a = -8
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