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Simplifying 7(3 + -1a) = a (3 * 7 + -1a * 7) = a (21 + -7a) = a Solving 21 + -7a = a 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 + -7a + -1a = a + -1a Combine like terms: -7a + -1a = -8a 21 + -8a = a + -1a Combine like terms: a + -1a = 0 21 + -8a = 0 Add '-21' to each side of the equation. 21 + -21 + -8a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -8a = 0 + -21 -8a = 0 + -21 Combine like terms: 0 + -21 = -21 -8a = -21 Divide each side by '-8'. a = 2.625 Simplifying a = 2.625
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