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Simplifying 5a + -28 = 72 + a Reorder the terms: -28 + 5a = 72 + a Solving -28 + 5a = 72 + 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. -28 + 5a + -1a = 72 + a + -1a Combine like terms: 5a + -1a = 4a -28 + 4a = 72 + a + -1a Combine like terms: a + -1a = 0 -28 + 4a = 72 + 0 -28 + 4a = 72 Add '28' to each side of the equation. -28 + 28 + 4a = 72 + 28 Combine like terms: -28 + 28 = 0 0 + 4a = 72 + 28 4a = 72 + 28 Combine like terms: 72 + 28 = 100 4a = 100 Divide each side by '4'. a = 25 Simplifying a = 25
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