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Simplifying -7a + 4 + 8a = 13 + -30 Reorder the terms: 4 + -7a + 8a = 13 + -30 Combine like terms: -7a + 8a = 1a 4 + 1a = 13 + -30 Combine like terms: 13 + -30 = -17 4 + 1a = -17 Solving 4 + 1a = -17 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 1a = -17 + -4 Combine like terms: 4 + -4 = 0 0 + 1a = -17 + -4 1a = -17 + -4 Combine like terms: -17 + -4 = -21 1a = -21 Divide each side by '1'. a = -21 Simplifying a = -21
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