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Simplifying 3a + 5 = 21 + -1a Reorder the terms: 5 + 3a = 21 + -1a Solving 5 + 3a = 21 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 5 + 3a + a = 21 + -1a + a Combine like terms: 3a + a = 4a 5 + 4a = 21 + -1a + a Combine like terms: -1a + a = 0 5 + 4a = 21 + 0 5 + 4a = 21 Add '-5' to each side of the equation. 5 + -5 + 4a = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 4a = 21 + -5 4a = 21 + -5 Combine like terms: 21 + -5 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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