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Simplifying 28 + 2a = 5a + 7 Reorder the terms: 28 + 2a = 7 + 5a Solving 28 + 2a = 7 + 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 28 + 2a + -5a = 7 + 5a + -5a Combine like terms: 2a + -5a = -3a 28 + -3a = 7 + 5a + -5a Combine like terms: 5a + -5a = 0 28 + -3a = 7 + 0 28 + -3a = 7 Add '-28' to each side of the equation. 28 + -28 + -3a = 7 + -28 Combine like terms: 28 + -28 = 0 0 + -3a = 7 + -28 -3a = 7 + -28 Combine like terms: 7 + -28 = -21 -3a = -21 Divide each side by '-3'. a = 7 Simplifying a = 7
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