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Simplifying 7a + 12 = 21 + a Reorder the terms: 12 + 7a = 21 + a Solving 12 + 7a = 21 + 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. 12 + 7a + -1a = 21 + a + -1a Combine like terms: 7a + -1a = 6a 12 + 6a = 21 + a + -1a Combine like terms: a + -1a = 0 12 + 6a = 21 + 0 12 + 6a = 21 Add '-12' to each side of the equation. 12 + -12 + 6a = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 6a = 21 + -12 6a = 21 + -12 Combine like terms: 21 + -12 = 9 6a = 9 Divide each side by '6'. a = 1.5 Simplifying a = 1.5
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