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Simplifying 5a + 7 + -4a = -21 Reorder the terms: 7 + 5a + -4a = -21 Combine like terms: 5a + -4a = 1a 7 + 1a = -21 Solving 7 + 1a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1a = -21 + -7 Combine like terms: 7 + -7 = 0 0 + 1a = -21 + -7 1a = -21 + -7 Combine like terms: -21 + -7 = -28 1a = -28 Divide each side by '1'. a = -28 Simplifying a = -28
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