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Simplifying 28 = 21a Solving 28 = 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 28 + -21a = 21a + -21a Combine like terms: 21a + -21a = 0 28 + -21a = 0 Add '-28' to each side of the equation. 28 + -28 + -21a = 0 + -28 Combine like terms: 28 + -28 = 0 0 + -21a = 0 + -28 -21a = 0 + -28 Combine like terms: 0 + -28 = -28 -21a = -28 Divide each side by '-21'. a = 1.333333333 Simplifying a = 1.333333333
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