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Simplifying 21 = 2(4a) Remove parenthesis around (4a) 21 = 2 * 4a Multiply 2 * 4 21 = 8a Solving 21 = 8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8a' to each side of the equation. 21 + -8a = 8a + -8a Combine like terms: 8a + -8a = 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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