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Simplifying 21 + 4a = -1(-1a + 3) Reorder the terms: 21 + 4a = -1(3 + -1a) 21 + 4a = (3 * -1 + -1a * -1) 21 + 4a = (-3 + 1a) Solving 21 + 4a = -3 + 1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 21 + 4a + -1a = -3 + 1a + -1a Combine like terms: 4a + -1a = 3a 21 + 3a = -3 + 1a + -1a Combine like terms: 1a + -1a = 0 21 + 3a = -3 + 0 21 + 3a = -3 Add '-21' to each side of the equation. 21 + -21 + 3a = -3 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = -3 + -21 3a = -3 + -21 Combine like terms: -3 + -21 = -24 3a = -24 Divide each side by '3'. a = -8 Simplifying a = -8
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