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Simplifying 12 + 2a = 3 + 7a + 9 Reorder the terms: 12 + 2a = 3 + 9 + 7a Combine like terms: 3 + 9 = 12 12 + 2a = 12 + 7a Add '-12' to each side of the equation. 12 + -12 + 2a = 12 + -12 + 7a Combine like terms: 12 + -12 = 0 0 + 2a = 12 + -12 + 7a 2a = 12 + -12 + 7a Combine like terms: 12 + -12 = 0 2a = 0 + 7a 2a = 7a Solving 2a = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 2a + -7a = 7a + -7a Combine like terms: 2a + -7a = -5a -5a = 7a + -7a Combine like terms: 7a + -7a = 0 -5a = 0 Divide each side by '-5'. a = 0 Simplifying a = 0
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