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Simplifying 21a + -28 + -1a = 72 Reorder the terms: -28 + 21a + -1a = 72 Combine like terms: 21a + -1a = 20a -28 + 20a = 72 Solving -28 + 20a = 72 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 20a = 72 + 28 Combine like terms: -28 + 28 = 0 0 + 20a = 72 + 28 20a = 72 + 28 Combine like terms: 72 + 28 = 100 20a = 100 Divide each side by '20'. a = 5 Simplifying a = 5
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