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